Wouldn’t the entire body is able to regenerate from a single part, without every tissue type present? I mean not much point in regeneration, if all it takes to disable you is removing both your eyes simultaneously.

I disagree that there “no point” if destroying the brain (not the eyes) is death.

I disagree that any part has to be able to regenerate, we lose cells all the time, and being able to cut off a toe and create a new person is, to me, a very different power from regeneration.

I agree that regeneration can create tissue types that are not present. The edges of the regeneration are probably the stem-iest of the stem cells and capable of “becoming” any other cell.

I think the “person” of Wolverine is most strongly embodied in the physical “shape” of the brain created through experience. New brain matter would would like not “contain” a Wolverine (at least initially). Parts that were only bones, tendons, ligaments, muscles, etc. might regenerate, but the don’t “contain” a Wolverine to grow into. But, we also know there are (at least) two thinking things inside each brain, one in each hemisphere, so I can imagine if the Wolverine brain is separated we might get multiple Wolverines – or we might get a Wolverine and some other things.