So in Words Of Radiance chapter 63 we see wit (Hoid) say this:
This is followed by:
So either we are seeing that odium can splinter anyone's soul. Or that Hoid is something more. We can gather from the second letter from the the mystery person to Hoid, that hoid is capable of coming back to life perhaps. With the person asking him something about his incarnation. So perhaps hoid isn't just regular but a type of force perhaps similar to a shard that let's do all the things he does. (I.e. the various magic systems.) If so, then perhaps because of this odium can splinter him like a shard. And perhaps hoid has either lost his connection to his sDNA or his spiritual part, or it has changed letting him use the various abilities he has. Someone else on the forums stated that in their personilization they where told that a common view of the spiritual realm would be heaven although it is not entirely right, this may be why he would be shattered and unable to be reassembled because he may be unable to access the spiritual realm. Thanks for reading my unorganized unformatted thoughts. Will edit when I reach a computer.
EDIT: also the respondent says in the second letter: