I think Zach is near the top of the NFL. Guys like Anthony Richardson and Josh Allen are a tier above, because of their size and arm strength.
Zach doesn’t have the same arm strength or physical size that those guys have, but he still has a great arm and is pretty mobile. From an upside perspective, I think Zach’s is pretty high still.
I don’t think he’s anywhere close to his ceiling. In fact, I think he’s pretty close to his floor. But if Zach was somehow able to reach his potential, he’s a guy that could go out and win you a game by himself. That’s the opposite of a game manager.