This to me just says teams didnt want a distraction from someone who they don't see is going to compete as a starter. I don't see much positive...
In Miami there is huge positive for him.
If he proves to be good enough, and beats out Wilson, he will be the backup of a starting QB that is one concussion away from being done, and even if Tua does prove to be passed his concussions issues, Tua will will miss time, and he will get a shot or many to prove himself, so worst case scenario for him, if he can make the best of it when he gets a shot, he will be highly sought after in trades if Tua proves himself this season.
Next year or in two years he is either starting for Miami, or traded to another NFL team to start there.