Well, Shunko still won't make that big of a change. If some Quincies are able to stop Ichigo's Bankai Getsuga from point blank without any visible damage, then it's just won't make that big of a differense in a fight if she uses Shunko. Only if she fights some very weak Sternenritter and has luck.
I know what you mean, but in shounen manga, strength doesn't have real life limits. I think Ichi not beating Kirge easily just boils down to lack of experience fighting quincies with Blut.
And I think Yoruichi would hurt SR more than most captains, mainly because she doesn't rely on her zan, and because of the speed.
Yea, I still think Soi Fong would have an advantage over captains like Hitsugaya, Komamura, and Byakuya, that rely on their bankai so much.
Maybe not a big advantage, but still something