He's entitled to his opinion and he's allowed to tweet what he wants. I'm sure Brad will take his opinion and those of many others under consideration before making a decision. It's ultimately Brad's decision and I'm sure that JB will respect the decision whatever it is.
Not banking on it
This coaching hire is becoming a can of worms and Jaylen has now opened it up. Puts Brad in a very tough position because you're asking him to improve the team and you're handcuffing him. Colleges do this all the time with coaches saying we need you to win but you have to do it 'our way' meaning only recruit the 'right' kids (see BC, Northwestern, Vanderbilt etc).
It doesn't work. You pay someone (Brad) to do a job, you need to trust him to do it. Jaylen is a player. But that's where today's NBA is heading and I think it sucks. Not a fan of it - at all.
So bottom line, Wyc is probably going to need to make a call. He's essentially going to have to hire the coach.
For the first time, I would consider moving Jaylen. This is not an atmosphere primed to have any real success - just looking at it like I'd look at a business. The odds are starting to favor this whole thing falling apart.