Snap judgments from Week 4 in college football

(Photo: Scott Olmos, USA TODAY Sports)College football's biggest story lines can build up — or get knocked down — in one snap. After a Saturday full of action and overreaction, we're here to help you figure out what's hot, what's not and what's true. Here are five storylines to know (and, in some cases, debunk):

This week's Snap Judgments:

1. Michigan is back! ... kind of?

No one is saying Michigan is a Big Ten or national championship contender yet, but the Wolverines looked better in Saturday's 31-0 win over BYU in all facets of the game than they have in years. Sure, the Cougars were drained from a daunting nonconference schedule, but even so, it's impressive what Michigan was able to do…