Well he gave an Ancient Zoan to Drake so is not that incredible
Yeah, the first half of the thread is a sure thing (the references to the Kamaitachi legends and even the physical apparence and combat style), the second half is more of a
'What if..?' let's say that is something I'm keeping an eye open for
Imagine how that would suit well his already estabilished combat style (buffing agility for example, which is already exceptional in Killer) while giving him the possibility to chose an Hybrid and a full Zoan form which he can use when more suited and to
produce something (whirlwinds is what fits the most with Killer and the Kamaitachi) like every Mythical Zoan (blue flames in Marco's case, elements in Kaido/Momo's case...)