While I would not say we are set. I agree with you about trading for the Trojan QB. We can get croyle in the third round, good arm and great value.
I don't think you can ever rule someone out unless you already have an elite player already playing the position. If you believe that much in a kid and hes there when you pick go a head and take him. Great players will find their way on to the football field. Just because we have Dewayne and Ellis, doesn't mean we should shy away from Williams if you think he's going to be a stud. My personal opinion is to take D'Brickashaw and have your franchise left tackle for 10 plus years. Then move Adrian Jones to guard. But thats just my take.
