It's one of three things happening here:
1) He's just busy doing something else, and is not posting.
2) He's been silenced by somebody
3) He knows he's about to be God-killed, is waiting for people to change the vote assuming he's an automatic death, then puts in a vote at the last second to save himself dying.
I saw MR post his name, but for the possibility in the latter option, I don't think he should be unvoted.