No, it probably means that Nazr will come in and be thrown to the Wolves early. He's going to have to play to learn the offense and defense, and I expect for him to get minutes right away.
If Horry is really hurt, there is no question that Nazr will be first off the bench. He's more useful than Massenburg. If he can get out there and rebound and defend a little, he shouldn't hurt the team too much and he'll be well on his way.