Already 2 weeks ago I had the theory that Peeka wasn't on the floor at all. Like Violet said he isn't a stone man, but a stone assemble man which leads to the conclusion, that he is a paramecia type and not logia. Now I think he is hiding somewhere, just controlling the stones to look like him and to distract the stawhats. In order to be in that body of his he would have to bury himself into stone, which would seem rather dull, as stone isn't a good protection.
Supporting my case is the new chapter:
Here you see that Zoro is in fact standing alone!
Supporting my case is the new chapter:
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Here you see that Zoro is in fact standing alone!