The sign of a true coach or leader is to have the magical skill to make his players play better then they, or anyone else expects they can. If a 34 yr. old veteran is playing better than a young greenhorn, he should play over that player, and vica verca. Also, if this is done, it can cause rivalries which will make the players step up, or they may lose their starting positions.
Also, to add a comment for which this thread poses: Mutu would be a wonderful addition to the Turin Giants, and at the same time a respected and dangerous player to whomever he takes the pitch against.