I don't exactly agree.
I basically ran two PGs at 1 and 2 last year in D.3 exclusively playing LI and some LP. My PG had 5.8 Assists with 13 PA in 31 mins, while my SG (11 PA) had 5 Ass in 35 min. So yes, Passing can absolutely make a difference at SG.
Furthermore, neither player had great JR (7 and 9 respectively) and still I was able to go 22-0, basically going the Timberwolves way of no wingplay to speak of, two PGs and two double double machines down low.