I've heard rumblings that Tom Phillips politicked his way into the Smackdown spot and is very political in general. I remember Rich Brennan's wife taking a shot at Phillips over just that after Brennan was fired.
(Screencap because she erased the tweet eventually.)
From Brennan himself:
"Tom's a good announcer. He was competitive from day 1. He was in NXT before I was. Whatever the rumors are, I don't have any issues with Tom. There are politics involved in every business, and it's not something I got involved in. I went to work, did what I was told, did the best I could and tried to elevate people around me. I never tried to tie anybody down. As far as with Tom, I don't know if Tom has the power to determine if I was there. Maybe he does, I don't know."
As for JBL, this all feels like wild speculation. His "Bring It to the Table" rant was kind of bizarre, but it didn't feel entirely serious to me. Who knows though. Obviously, it's hard to give him the benefit of the doubt considering his past history with Meanie, Styles, Lance Storm, etc.
Anyway, there's a very easily solution to all of this: In the next draft, move Mauro over to Raw as Cole's replacement (since Cole has talked about wanting to step away from the booth and take on a behind-the-scenes role). Of course, I doubt Vince will ever "trust" Mauro to be the "face" of the announce table after missing WrestleMania because he was "too weak" to "conquer" his "pesky" mental health issues.