You clearly have not done your research on Tua (and maybe even know nothing about him?). Yes his arm talent is off the charts, especially his accuracy, but so are his intangibles.
Look what people who know him say about his work ethic and, professionalism. Even opposing college coaches and players talk about what a great person he is. He is the epitome of what you want in a franchise quarterback on and off the field. Well spoken, incredibly nice guy from a loving family, never been in trouble, his teammates have the upmost respect for him, etc. He does need to continue to progress with his reads, but what college quarterback doesn't? Oh and his ability rally teammates when things are down? How about coming into the game for an Alabama team that was getting their but kicked in the national championship against UGA at halftime as a true Freshman entirely cold without playing the whole year and leading them back to win with arm? Is that enough of an indicator for you?