Braxton played behind two completely different O-lines in 2013 and 2014. Hyde was not a very good runner in 2013. The TE was not an NFL TE in 2013. One of those 2 WR was not highly thought of his Junior year when playing with Braxton.
JT's father says Braxton should be the starter next year.
AND btw, Braxton is Urban's favorite. More than once Urban has said that Braxton is the perfect QB for his offense.