I would have to go with McDonough also. He really got tough on top last year and racked up the bonus points and pins over his frosh year.
The only 2 losses of his career have both graduated and he is going to be favored for bonus points in almost every match this coming season.
Iowa does wrestle a few less matches than most other teams which could set him back a little bit, but he's also never been a guy to miss matches (whether it be injury, rest, etc).
Taylor and Oliver both could easily put up numbers that rival or surpass McDonough. I just think his consistency, dominance, and lack of challenge come NCAA's makes him too hard to pass up with the #1 pick.