You just named 4 guys who have proven nothing at the NBA level. Just because they can scheme well in college or because there players in college like them doesn not mean the same would be true in the NBA. Could some of them end up beng good NBA coaches? Sure. Could some of those end up as good a coach or better than Mike Brown? Perhaps. But the big flaw is that you already have assumed and assigned that to them, with no basis in fact or experience. That is a mighty big risk to take for a third system and third coach in three years for a young roster.
You also give all the credit to the improved play post Grant to Griffin vs. Giving it to Brown and the coaching staff.
I don't think it's coincidental that this team immediately began playing better after Griffin held a meeting with the team and espoused the need for players to have trust in one another. And that if they played without trust and selfishly, there'd be plenty of time to ride the bench and figure out how to play team basketball. Why it took Grant getting fired for that message to get out is actually what is troubling. Again, it shouldn't take the GM to be the team psychologist. But Griffin's philosophy on team play is exactly why he is being tied to the New York Knicks GM position. Griffin is a protege of Steve Kerr who is a protege of Phil Jackson. In any event, Mike Brown absolutely does not fit into the philosophy of a Phil Jackson, Steve Kerr, or David Griffin run team.
You can disregard everything I've just said, but trust me when I say David Griffin feels communication skill is the most critical attribute a Head Coach needs to have to be successful. When the coach can clearly convey thoughts, ranging from offensive/defensive principles to why he's utilizing a certain substitution pattern, or why one guy got 10 minutes instead of 25....those are things a Head Coach in the NBA needs to be able to do nearly flawlessly. It instills trust within the 4 walls of a locker-room and allows players to develop without having their confidence scorched or left misunderstanding why they aren't seeing minutes. That built up trust is also what allows good teams to succeed in the fourth quarter of close games when all the chips are down. It's why Phil Jackson used to have his Bulls practice in 90% darkness so they'd have to trust that guys were where they were supposed to be without actually seeing them.
Mike Brown just isn't this type of guy. He isn't wired to be a part-time X's and O's coach (which he struggles with anyways) and a part-time psychologist (which he really struggles with). Mike is a workhorse. He feverishly breaks down video and tries to extrapolate what he sees in game film and practice court study into the heads of players. He understands defense and has made his mark there, but he hasn't passionately changed the culture of this team. Players don't love Mike Brown. They come to respect him but it isn't in the same realm as a guy like Phil. It isn't that Mike is a bad guy or has no place in the NBA....I just don't see him having a place with the Cavs if Griffin is named GM. And the opposite is true...if Mike retains the Head Coaching job, I don't think Griffin sticks around in Cleveland.