I believe Ross when he says he will let the next HC decide if he wants to go with Tua at QB or bring in his own QB. In fact I will be surprised if a new HC would take the job if he was told he would have no say over who the QB will be while he is the HC.Yeah, I don't see Ross as a Jerry Jones type. I don't think he would overrule the coach and GM on personnel matters.
I think they will tell him they would like to see how Tua plays next year and if the HC doesn’t believe Tua is the answer over the long term, they will let him decide what he wants to do at the QB position going forward.