I don't get Deathmatcher's comment, but FJH's is implying that Shikieiki was originally a jizou statue. I forget the where I heard it exactly, but it's said that she was a jizou statue that had received enough faith to ascend to a higher plane of consciousness or something. Promoted to living existence, if you will.
Man, I really wish I remembered where I heard that, I visited the site so often and now that someone asks, BOOSH gone.
There is an extra material in the 5th touhou manzai where two jizous are talking to each other. One, who is doing the same gesture as the jizou in this image, is called Mike.