Start Mac, Bench Bryce, cut Tua
Tua probably did more with nothing than anyone else, when a play broke down he'd fling it out to someone or scramble around to make something happen more. Bryce has this ability, but he's not confident enough to do it as well or doesn't want to make as many mistakes as Tua did pushing it. But Tua did make a lot of mistakes, one of his biggest was when he held on too long and tried to run away and ended up with a broken hip.
Mac had total command at all times, and that's what I want in my qb. He could make things happen, but it was more with a side step, or a simple run when no one thought he would. But he was pinpoint accurate, especially on the long throws. Tua was not as accurate on those, seems like he always over threw the long ball or under threw it.
Bryce may be the best of them all, but he's only had 1 year of play, and only 2 years of practice. Mac had the benefit of being in the program for what, 5 years? Bryce plays with command, he's cool and collected, but he has that escapability that I think he's been too reluctant to use, though later in the year he started improvising more. He could go down as one of the greatest, but let's see it happen first.