He trusts Bruce too. In the game against SDSU, Bruce was the only WR to catch a pass and I'd have to assume Petras only targeted maybe one more guy at that position. Other than that, Williams caught two passes out of the backfield, their FB caught one, and their two TE's combined for 3 catches.I think you put a safety on him and jam him at the line as much as possible. Kind of the stuff that other teams did to Charlie K. the last couple years. Just slow him getting off the line enough to throw the timing of the play off a bit. Might want to even double him because at this point he is the only guy Petras trusts.
Stuff the run, force Iowa into obvious passing situations, and make Petras throw to guys he's not comfortable throwing to. Hell, he's barely comfortable throwing the ball to anyone.