For whatever it's worth, I see Cousins, Whiteside and Howard in different categories.
D12 has blown up locker rooms and has publicly demanded touches. He's still doing that, which is crazy to me.
Whiteside is a stat-chaser. He's been a decent soldier lately, but fundamentally he is about "getting his" over the team. He can't help himself. I will say, I don't understand why Drummond is desirable but Whiteside isn't in the free agent market. They're very similar in their mindset.
Cousins is diminished by injuries and is explosive emotionally. He has shown a willingness to take a smaller role, and he's generally been a good teammate.
All three have shown a propensity to sulk at times, albeit for different reasons. I'd take a chance on Cousins, and maybe on Whiteside. I think Cousins would most accept a 10 minute per game role.