Adrian Peterson has high-ankle sprain

An MRI on Vikings RB Adrian Peterson's ankle reportedly revealed a high-ankle sprain.  Bad news.  That's usually a 4-6 week injury for a RB, although we're still waiting for an official timetable from the team.  AP isn't likely to make a fantasy impact at least until playoff Weeks 15 and 16.  He's obviously still worth hanging on to.  In the meantime, Toby Gerhart will step in as Minnesota's lead back.  He carries some value since he'll likely see 15+ touches per game, but he's a mediocre talent on an offense that figures to be pretty anemic without AP.  Consider Gerhart a RB3 or flex option as long as Peterson is out.