Pain's body gets punked by 12 year old Genin
Itachi's crow bunshin defeats 2 Naruto KB.
Seems like base Sharingan does better vs. Rinnegan against kage bunshin.
Some will argue that this is only one of Pain's bodies, but this was only Itachi's crow bunshin (only like 1/10th his power).
Besides this, does anyone actually believe that Itachi would get harmed by Konohamaru? Does anyone believe Konohamaru could trick Itachi? I don't think so, not even his crow bunshin (which defeated 100% Naruto).
I think Itachi could make 5 bunshins and defeat Pain, plain and simple.