Ummmmmmmmm. Really need to see the details on this, but restructuring TA is just not a good idea in general.
Hmm, why?
Is he injury prone...Sure
Is he unreliable for entire season. Yes
The guy is also elite, and when he's heading up the left side, Tua more then not, does not have to worry much about that side.
He's a great, and willing teacher. He is as technically sound O-linemen as you will find, and he is willing to put the time in to help teammates get better, and closer to the type of linemen he is.
He's a team player, if it's the playoffs, and he is in huge pain from an injury, there is no way he will still not be playing, as well as being a good positive presence on the team.
His Injuries are annoying, just like how annoying Miami leading the league in quality player season ending injuries every year is, but that still does not negate him being one of the best at his position...Even at his age.