This is a part of it. There's also just the fact that Mookie doesn't care about what team he plays for, as long as he's getting the most money. That doesn't scream 'team' concept to me. That screams "me, me, me!"
Also, I remember reading a comment about how part of Mookie's arbitration settlement involved him getting a private suite on the road. I don't know if that was true or not, but if true, what kind of message does that send to his teammates?
IMO, and it's only my opinion, when a player is going to hold out for the most money without regard to any other factors, there is a lot of ego involved. I think most posters have agreed with that. This is a self-centered approach, not a team approach.