Different? Definitely. But he has a strong arm. So, like Jim Furyk different IMO.
His only issue with mechanics is that he’ll have more of a propensity to have balls knocked down. But side-arming seems to be becoming more and more common at all levels of football.
His other main issue outside of decision-making is not putting enough touch on short throws.
If anything keeps him out of the NFL, I don’t think it would be mechanics…