Payton:
"I would say that probably early into the process, shortly after these workouts, he stood out in a lot of areas," Payton said on Thursday night following Round 1 of the draft. "You pay close attention to all the film study. Obviously, he’s played a lot of football, but [he stood out in] sack differential, turnover differential, accuracy, third-down passing. [He was] first, first, first, first in this class. First in end-of-half, first in end-of-game, two-minute situations, second in red zone. Then let’s do another passing statistic and remove a lot of the short, underneath throws. Obviously, that’s part of what they do offensively, and you remove that, and you come back with the analytics, and it’s still first. I would say his arm strength was—we saw it at the Pro Day—but even in the private workout, was very good. He’s super smart."

Zach was great his junior year against a bunch of cupcakes brought on by Covid. His workouts showed a lively arm and athleticism. All the top QBs in his class (with the exception of Trevor Lawrence) have been a disappointment and traded from their original teams.

To your question, he's unproven in the NFL but you'd have to go with Bo.