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The San Francisco 49ers suffered what seemed like a crushing blow early last September when running back Jerick McKinnon tore his ACL.Kyle Shanahan admitted the injury resulted in significant changes to their game plan. McKinnon had not secured a consistent starting role with the Minnesota Vikings Dante Pettis Jersey , but in Santa Clara he was going to be a huge part of the ground and air game.The 49ers will welcome McKinnon back with open arms this offseason, but they do it now knowing they have a heck of a weapon in running back Matt Breida. The former UDFA had a solid rookie season, averaging 4.4 yards per carry behind Carlos Hyde. In his second season, following McKinnon’s injury, he had a breakout season. An ankle injury slowed him for stretches of the season, but he finished with 814 rushing yards at a 5.3 yards per carry clip, and another 261 receiving yards.Last month, I came across this ranking if players (via Oscar Aparicio). It ranks running backs using expected points added (measures a play’s impact on the score of the game). Breida shows up No. 10 on EPA per rushing play and No. 6 on EPA per play for combined run and pass plays.I have little doubt that Kyle Shanahan will figure out how to effectively use both McKinnon and Breida this coming season. But I am still fascinated to see just how that happens. Add in Raheem Mostert’s breakout season before his own injury and there is going to be a lot to track.I won’t say it’s an embarrassment of riches at this point because there are questions about all three backs. McKinnon is coming off a torn ACL, Breida had a strong year Kaden Smith Jersey , but his durability is a question, and Mostert had a strong run for a few weeks but it’s a question as to whether he can build out over a season as a complementary piece. But all that being said, the 49ers have plenty of pieces to work with heading into 2019.Live updates from Kyle Shanahan’s Week 4 Monday wrap-up press conference The San Francisco 49ers lost in Week 4 to the Los Angeles Chargers in C.J. Beathard’s first start of the season. It was a close loss, with Beathard putting up a strong effort, and the defense making some big stops amidst still inconsistent tackling. But the 49ers dropped to 1-3 and begin preparations for Week 5 against the Arizona Cardinals.The team returned to Santa Clara Sunday evening, and Monday is a day to wrap up the previous day’s game and begin preparations for the coming week. Head coach Kyle Shanahan will meet with the media at 4 p.m. PT to discuss all that. The 49ers will stream the press conferences Twitter, Facebook, and the team’s app. The 49ers beat writers will also have updates from the media sessions. I’ve embedded our beat writer Twitter list so you can follow along. We’ll have a transcript later today.A Twitter List by NinersNation