We won't have enough roster spots to have four rookies make the team out of camp. Most likely, next year's roster will look something like:
Rondo
AB
Pierce
KG
Bass (or MLE replacement)
Ray Allen or JET Terry
Jeff Green
Stiemer
Dooling (or vet-min PG equivalent)
Pietrus (or vet-min SG equivalent)
JJJ
Sully
Melo
I know not all of these guys will return, but I'd bet most of them do (or their roles are filled with equivalent veterans). That leaves two spots open for Moore, Kris Joseph, Sean Williams, and any other veterans/projects we might want to sign. It's hard to bring in four rookies unless you do a COMPLETE rebuild. And, we could be really tight for spots if they re-sign Bass AND bring in someone like Camby, or re-sign Ray Allen and bring aboard JET (which I doubt happens, although they profess that to be the goal).
EDIT: Forget it, thought this was an "in addition to Joseph" proposal. Sure, fine - higher pick would have been better. Doubt it makes much difference in the end.