Unless Fitzpatrick gets injured midseason, Tua basically has a whole year to not only get 100% healthy but put on some mass and train in a way to avoid future injuries. Plus, learn how to throw the damn ball away so he won't get hit. That was an issue for him like it was for Tannehill.
QBs don't get hit as much in the NFL because it's practically illegal, so as long as he throw sit away more, he should be fine.
Unfortunately I don't think that's gonna happen. Unless Tua is injured, the pressure is gonna be on Flores to play him. I think Flores will have Fitzpatrick start the year, but every passing week the pressure is gonna build to put him on the field and see what he can do. If he sits an entire year it will shock me. This actually was another reason that I thought Herbert was a better choice, I thought there would be far less pressure to start Herbert and give him more time to become the starter then there will be with Tua. All the fans that wanted him are going to want to see him play sooner rather than later. They've already been waiting a year for this, I don't see them having much patience and honestly I don't think the owner and perhaps even Flores and Grier will have that kind of patience.