A team works by putting their strengths together in order to perform together and complete the task. A person can be lazy if they can preform their strength when it's needed to. Usually when it comes down to having to perform an important task, the team snaps out of being 'lazy', and work their hardest. And if not... then the lazy one is usually scolded.

It can still be considered a team, just as long as those who are being lazy still give it their all when the time comes.