You are all missing the point. You as GM are not actually drafting those guys, you are drafting their future results; e.g., a great QB driven team or a great RB driven team. So, if you believe the next Tom Brady and Barry Sanders are both in this draft and both are available at #1, you would have to pick the next Brady. According to the way the game is played today, that would maximize your chances to win.
Again, does anyone anywhere think the next Tom Brady is in this draft? Not that I've seen.
Countless people have called Barkley the best RB in years if not decades.