himself. He is putting people in orders that he is being told from NFL GM's. He is basically making predictions based on what he is hearing from NFL teams.
Simms isn't basing this opinion on anything he's heard. It's completely his own evaluation.
If you want to be right on draft, Kiper or McShay are the guys to look at.
If you want to be right about who are actually going to be the best players. Kiper and McShay miss too much.