Glad you are now discussing the merits:
Tua's ceiling is as a solid player:
Tua is small, but in today's NFL that is less of a drawback than it was in the power eras when the rules didn't protect the QB so much. Tua is elusive, but nobody will ever confuse him with Kyler Murray, Lamar Jackson or Michael Vick. In fact, he's not the running threat that Justin Herbert is, or Josh Allen, or about half of the NFL. His mobility is ... NFL average. Not bad, just not elite. Tua's running ability is probably on par with guys like Aaron Rodgers, who while he loves his Discount Double-Check, is only an average NFL runner. Rodgers is MVP because he uses his mobility to showcase his cannon of an arm, quick release and unbelievably accurate throws. As a thrower, Tua is accurate ... but not dominantly so. Tua's best features are 1) decision making (as shown through avoiding INT's), and 2) accuracy (as shown through giving his guy a chance to catch the ball without allowing the defense the chance to get an INT). Those are the things demanded of all starting NFL QB's. If these become elite, then his decision making and accuracy will rise to Brady levels ... but Brady is 6'5 and still has a strong arm. Tua will need to make those throws when the DB's get a beat longer to react, so it will be tougher.