If you're talking about Zach like 4 years ago you might have the beginning of an argument. Fact is , TKO can shed blocks better due to his superior strength, he covers better, blitzes better, is faster and makes more plays than Zach (fumbles, INT's, Sacks, 3rd down stops). They are probably equals in tackling and the amount of study they put into the game. Honestly though, you'd have to see TKO at MLB to really compare the two.