I can't really see PJ3 as a starting SF. Doesn't have enough skills. So, he's likely to get NBA minutes as a backup PF perhaps a backup SF. So, with KG, JJJ and Sullinger at the 4, I just don't see where PJ3 fits in.
Imagine a lineup in a few years of:
Rondo
Bradley
PJ3
Sullinger
Melo
Where's the outside scoring, go to scorer? Our SF needs to be a prototypical SF who can carry the load. PJ3 is not that guy.
How's that ... feel better?