Not sure why the mental association
Basically Kyoshiro's "goodness" (especially if he is Denjiro) is very much dependant on how he's treated Hiyori.
If he is indeed a "good" character, it's hard to reconcile that with the idea he is making her have sex with men for money. And if he's Denjiro, then that just becomes a whole new level of disgusting given he's been around her since she's a kid
On the other hand, if it's just a giant scam and Kyoshiro and Hiyori have been working together to con scum out of their money (which I think is by far the more likely solution) then there's more room to argue that Kyoshiro is a "good" character, one who has his own reasons for ostensibly working with Orochi. This makes the most sense to me, because
-Oda is not the type of writer to have us see a little girl's life story force her into prostitution
-Kyoshiro is clearly playing his own game, with Hiyori's survival, him slagging Orochi and the way he looked when he described himself as the Shogun's dog.