Actually, I thought of something interesting: Futility-san has at least three bloodlines, possibly more.

If Senko got ahold of his cells... Well, I've previously established that trying to graft more than one bloodline at the same time could be problematic...

And if you remember, when Kabuto first grafted Orochimaru's cells to himself Orochimaru's cells were trying to eat him.
Spoiler: Picture

So, if Senko does get ahold of his cells... Well, I'm imagining an arm that ransomply expolites into ears and strips of paper which provides complications for a story or two before Senko's body fully adapts.