I am very late to this thread however was just reading through. Personally I don't see TB as being that skinny or fragile looking.
Actually, they were saying that about Mike Glennon right after he was drafted. The local radio guys kept talking about how Glennon was too skinny and that there was no way he could step in and play in the NFL this season. Not only did he play, he took most of the snaps and turned out to be very durable after taking hits.
Glennon looks like a bean pole compared to Bridgewater.
I am still undecided where I want the Texans to go however I am leaning towards TB. I like the reports that he has a high football IQ and is a true student of the game.
To me Johnny Manziel looks more fragile. The guy just looks like he would get killed on a NFL field. He also looks like Brick from "The Middle".