Doc loves his vets, no matter how bad they are.
Moore is the better player, but his age is holding him back. 9 times out of 10, doc would rather lose with the old vet who is playing badly, then trust a rookie.
Its always been that way, as soon as Doc gets a vet on this team, all rookies get pushed to the end of the bench, even if they are better than said vet.
Heck, if P.J. Brown came out of retirement I bet you he would be the first big off the bench, even if he had to use crutches.