[philiphodgen]

Personal experience: no. It damages the entire team. I've seen how team morale improves when such a person departs.

Talked to a friend today who is way, way good at polo (the horse type). The head guy at his stable picks players (in South America) as follows: (1) he asks around for "nice" people. (2) he goes and watches them play. (3) he extends offers. Screening for potential members of the team happens in that order.