It is not an easy role for him or any player. It is tough to prove yourself in limited minutes. You want to do whats best for the team, but you also know that you are coming back out shortly. One thing that is critical is that he must be attentive to details. You can't have a scenario where you come in and don't know how many seconds are left on the shot clock. That just can't happen. Proving yourself in limited minutes is not trying to do too much, but also executing everything within your ability, down to the finest of details. Again not an easy role, but it's his role on this team.
This is really well said.