Big things were expected from McKinnon last year after he left Minnesota to join coach Kyle Shanahan's RB-friendly offense in San Francisco, but a torn ACL suffered just before Week 1 ended his season before it began. A healthy McKinnon possesses a wealth of athletic gifts and showed flashes of power, speed and receiving skills with the Vikings, but his lack of experience as a running back (he was an option QB in college) has always restricted his vision and ability to set up blocks. Shanahan has a knack for scheming guys open and getting them the ball in space, so McKinnon's flaws might not be as big of a limiting factor with the 49ers. What will limit his ceiling is the addition of running back Tevin Coleman from Atlanta, as well as the continued presence of Matt Breida, who totaled 1,075 scrimmage yards last season. McKinnon still seems to have a place in the team's backfield plans (San Francisco allowed his 2019 salary to become guaranteed rather than releasing him before April 1) but even Shanahan's system will have trouble finding enough touches for three running backs. McKinnon was in danger of being the odd man out even before his preseason knee issues cast his Week 1 availability into doubt. It's no longer clear when or if he'll be ready to play.