The biggest positive with chemistry/cohesive groups is being tight enough to be able to hold each other accountable, to be able to tell a teammate to pull his head out of his ass.
The biggest negative with chemistry/cohesive groups is being so tight and groovy that you don't hold each other accountable out of fear of rocking the boat of good feelings. (I think this became the Pistons' problem).
But I don't really care what Perk thinks about the Celtics roster, and as a role player, I really don't care what he thought about the roster when he was on it.