I don't really mind Denjiro being Kyoshiro, I just might have found it cooler if he wasn't and Kyoshiro was more of a rogue with his own agenda.
I wonder if Oda didn't intend for Kyoshiro's hair to be blue like it is in the anime. Because when we see his new hair for the first time it really feels like it suddenly whitened from his rage and emotion. But maybe he just dyed it.
Or maybe his hairs were a very dark blue, and turned light blue