The problem with Ty Sambrailo was always that his repeated injuries prevented him from getting in the weight room and adding the muscle mass he needed to play LT in the NFL. He's far behind his projected development curve and nothing indicates he's going to suddenly blossom into the player they hoped when they drafted him. He's a bust. DMac doesn't think he'll make the team.
I don't know about that, but they certainly aren't starting him at LT suddenly after him not making the field at all in 2016. At best they keep him on the roster, his shoulder is good enough to lift, and he gets better over the course of the season and shows enough for him to stay on the team. Then maybe, maybe in 2018. But, all that is a pipe dream probably. Most likely he's a guy who just didn't pan out due to injury. That happens.