Is it typical so have so many sunfish types in such a small pond in Wisconsin?
Yes and no. The BG were they only ones planned as thats what I ordered (still mad at the hatchery), the PS were wanted for snail predation, and the HBG and GSF were the fish I didn't want although I am having a lot of fun with how big the hybrids are getting on an ultra light rod.
As far as other water bodies, yes it's not uncommon to have plenty of PS mixed in with your BG, and the GSF are always there to steal your bait. Also 99 times out of 100 the normal sunfish are mixed with YP and BCP, the former I plan on stocking soon.
In short, I've never seen a body of water in Wisconsin that the only sunfish is BG.
