How's that any MORE of a good theory than Law being on the island and responsible for the Half-Samurai?! I know that wasn't related at all but where's ANY support on this? Most swords in OP are katanas! Where they all stolen from Samurai? I really doubt that.
/the following is not directed at you specifically, sorry if it sounds aggressive./
Seriously, some of the "theories" that pop up are just pure fan-fiction with NO supporting evidence whatsoever.. I know that this is kind of the point but it gets really frustrating when people continue actually believing in it and making up evidence to support their case.
Buggy is NOT behind this, he can't be, his fruit has nothing to do with "halving" someone beside himself. It's just not a possibility within the OP universe and the powers of his fruit, plus, the Legs wouldn't be stuck to the dragon then. Don't go about suggesting that he "honed his skills" and can now apply it to other people that's just plain redundant thinking and stupid. The only explanations so far that I can THINK of are either Law being responsible, because THIS IS EXACTLY WHAT HIS POWERS DO! - or the Samurai himself having an unknown ability (which is not probable since Buggy's fruit already is about splitting oneself.)
There's always a lot of things open to interpretation in a new chapter, but just try and keep it reasonable.
PH=Punk Hazard. Those guys are, in any way, FROM the facility. What that MEANS is left to be answered.
-> Things to rule out: those guys being Law's crew or Smoker's guys. I mean, seriously?
Legs=Samurai. If there's more than one, if this is the one that stabbed the guy on the cold part, is left to be seen. Why exactly and how he got stuck to the dragon - left to be seen.
-> Again, there's always things we can rule out though. Including Buggy. Or that this is the guy we saw on the cover with Crocus. Or that he's Shiki (whoever came up with that thought in the first place?!)
Dragon: Probably not the only one, it'd not seem right - it's still possible Luffy heard him thinking, from that last panel of chapter 655. This chapter, however, he didn't. Just "Gurororo-ing" all over the place, which I personally loved.
-> Things to rule out: Being a Zoan.
Anything else?! Feel free to challenge me on these points if you really feel like it. But I'd think most reasonable people here see it the same way.
Actually the way i recall it Law can only dissect people without dropping blood or harming them or injuring in side a special barrier that he creates. That's how I remember the fight back in saboandy been a long time too lazy to check it up again though so please don't mind if I'm wrong.
And the Body parts except the mouth can't speak. All law could do was dis-sect the body without harming anything and still keeping the parts alive. He could not make parts like legs and his genitals talk. So I don't think its law its gotto be someone else someone/something new.