I would put Luck a tier ahead of Tannehill based off my eyes, but the stats have them close to even, except Lucks win/loss stat is obviously much better.
And I would put Dalton and Cousins a tier ahead of Tannehill based on stats, even though my eyes would say they should be in the same tier.
And what are your eyes seeing? Serious question?
Personally I think the only thing you see is what you admitted to - statistics and the win/loss column - which is invalid information to analyze a QB's mechanics and skillset under center.