i agree with southpaw17,
it depends on the tactic that you are playing, i've been an LI team and for my sg spot i noticed that a player with some IS does a better job then one that dosnt have any IS, although i wouldn´t prefer it over JS.
for my pg spot i prefer a player with superior driving skills and the IS is not as importent...
when you are not playing an inside tactic, forget about the IS for your guards...