PLAY HIM, before you BUST him.....Start the kid, get him in there. Not just garbage time, that reaaly adds up to nothing. Play this kid with the starters, let him get the confidence of playing with the best in the league. Guys who know how to set him up, roll to a pass, set a good screen, give him some assists.
Garbage time is vs the less-good players, in an "everyman for himself " environment. That really helps no one. When you play with good players, you rise to their standard. Likewise the same with scrubs.
NOW is the time to put him in. With all the injuries, and the time of year. Play your new guys hard until the allstar break. See what you have as back up players. Showcase them in case of needed trades.