As for who stays no matter what, it's a short list.
Colbert who has done a good job in the last two drafts and Munchak who could be the best Offensive line coach in the game STAY.
As for who goes, its start with Ben first. After that, we can pick the best course of action.
My dream scenario, which will likely never happen it to it this.
1 ) Ben stays!
2 ) Tomlin is traded for draft picks. Bill Cowher offered the role of head coach with a three year deal, if he declines, give Munchak a few interviews. If Munchak is not deemed ready, we get the pick of the litter for coaches to hire.
3 ) Bell is re-signed to a 1-2 year franchise tag deal with incentives that say no suspension and 14 games played = a bonus
4 ) Haley leaves. Had it with him. He's a money on a racehorse who can look great due to the talent, but if his stallion gets into trouble early, he can not guide him out of it.
5 ) Bryant gets his life back and passes all drug tests. He is a true back breaker type with Randy Moss type of talent.
6 ) Brown? I'm divided. He's great, but only proven great with Ben ( he's Joe average with Landry ) and has become a diva level type of distraction. Brown's game isn't built on size or speed, its quickness, and that can go first with age.
If someone offers two first round pick, and a third with the 1st and 3rd being a top 12 pick in the round for 2017 for Brown...I'd really have to think about it.
7 ) Draft for defense again, unless Brown leaves, then pick a WRwith one of the first round picks.