While the 49ers are still reeling from the loss of their franchise quarterback for their season San Francisco 49ers Hoodie , it’s probably to shift some focus over to some positive things about the 49ers’ offense. Head coach Kyle Shanahan has always prided himself about having a successful run game and San Francisco is delivering on that this season.Even with top running back Jerick McKinnon sidelined for the entire season with a torn ACL, backups Matt Breida and Alfred Morris have seamlessly stepped in, carrying the burden thus far. After three weeks, Breida is tied for the most rushing yards in the NFL, with Cowboys’ tailback Ezekiel Elliot (274). San Francisco is second in the NFL in rushing yards per attempt (5.6) and second in rushing yards per game (152.7) due to the skill of the running backs, but also in part due to the success of the offensive line. Per Pro Football Focus, 49ers’ rookie right tackle Mike McGlinchey is having a phenomenal season, posting an 84.7 run-blocking grade against the Chiefs and possessing a run-blocking grade of 79.4 through three weeks — which is second in the NFL. Combine that with veteran lineman Joe Staley and Weston Richburg running over defensive linemen and the 49ers’ running backs have wide open lanes.How wide open, you ask? The 49ers have 230 yards on the ground before they are touched by a defensive player — a number that’s second behind Carolina, according to ESPN. Sunday’s contest against Kansas City backs that notion up, as Breida and Morris broke off big runs Youth Customized San Francisco 49ers Jerseys , their longest being 26 and 16 yards, respectively.On Breida’s biggest run of the day, it was a huge gain due to his creativity on the play. The running lane closes quickly, but the 49ers’ second-year back has a solid presence of mind to cut it back to the left side of the field, where there’s no defenders. That allows Breida to kick it into a higher gear and gain 26 yards on the play.49ers have a lot of success on these misdirection, where they get a wide receiver running across the line of scrimmage to freeze up one of the defensive ends, allowing the blockers to shift in the direction of the run. In this case, it frees up a huge hole for Breida to gain 21 yards. It wasn’t until early in the third quarter that the 49ers found some offensive rhythm, especially in their running game. Quarterback Jimmy Garoppolo bobbles this snap, but is able to toss it to Breida, who takes it for a 27-yard gain.On this play www.49ersauthorizedshops.com , the 49ers offensive line does a solid job run blocking, bringing in tight end George Kittle as an extra blocker and allowing fullback Kyle Juszczyk to be the lead blocker. The opening gave way to a six-yard Morris gain on first down. Having positive first downs have been key to sustaining long drives for San Francisco’s offense.Another strong example of the 49ers ability to line up and run block. All the linemen up front hold their blocks, creating a lane for Morris to gain nearly 10 yards before first contact. Then Morris is able to use his physicality to turn it into his longest run of the afternoon.I mean, look at this hole created by the 49ers’ offensive line. You or I could run through that opening for a positive gain. Morris takes that for an easy eight-yard gain and the 49ers have a short second down. Having successful run plays, opens up the dangerous play-action passing game, which is the base of the Shanahan offense.Here’s another wrinkle in the 49ers’ running attack, as Garoppolo hands it to Juszczyk, who has the option of running of the ball or tossing it to Breida. In this case, the 49ers’ fullback does the correct thing, tossing it to Breida. It eventually turns into a nice red zone gain for the 49ers of 13 yards.No matter who’s in the backfield for San Francisco, this offensive line unit is absolutely mauling the defenders and creating wide open running lanes for the backs. Without Garoppolo in the lineup San Francisco 49ers Womens T-Shirt , I’m sure defenses will start to adjust to take away the running game primarily. Defenses should start to stack the boxes with eight defenders and force backup quarterback C.J. Beathard to make throws from the pocket. If the 49ers can continue to run the ball down opposing defenses’ throats then, I’ll be impressed.Shanahan: ‘We went pretty hard. We went real hard [after Khalil Mack]’ The San Francisco 49ers have not been shy about acknowledging their interest in notable trade candidates. After Khalil Mack was traded to the Chicago Bears, general manager John Lynch said the team had gone in aggressively but with some parameters. On Friday, Lynch said the team had looked into wide receiver Josh Gordon, but the coaching staff’s history with Gordon made them decide it was not worth the cost.On Friday afternoon, head coach Kyle Shanahan followed up on Lynch’s previous comments about Khalil Mack. He said, “We went pretty hard. We went real hard.” He was asked about setting an aggressive mindset, and acknowledged that is the tone they want to set.The Bears landed Mack in a deal that saw them send first round picks in 2019 and 2020, a third-round pick in 2020, and a sixth-round pick in 2019 to the Oakland Raiders in exchange for Mack, a second-round pick in 2020 San Francisco 49ers Hats , and a conditional fifth-round pick in 2020. The deal also included Mack signing a six-year contract extension worth $141 million.The 49ers had more cap space than the Bears, but Chicago also has the guy they hope is their franchise quarterback under his rookie deal. Add in a chance to take a good defense and potentially (as proven since) turn it into a great one, it all added up for the Bears.I don’t know how the 49ers view the potential of having a record-breaking quarterback contract, and then in the same year following up with a record-breaking defensive contract. The 49ers will hopefully eventually be extending DeForest Buckner to a record-breaking contract extension in the next two or three years. I imagine that played some part in the decision to not push harder on Mack.It is also worth noting that it is possible the Raiders simply had no interest in dealing Mack to the 49ers outside of a true Godfather offer. The Raiders will be sharing the Bay Area with the 49ers for this season and probably next season. Add in leaving for Las Vegas and in turn leaving Mack here with the 49ers, and I would not be surprised if it simply was not going to happen outside of an offer that would have been crazy to make.We’ll likely never know for sure all that went down in any calls the 49ers made to the Raiders. Some will call [site decorum] and say the 49ers are not being aggressive enough, and they’re entitled to their opinion. I would have loved to seen Mack added to this defense, but hey, such is life.