09:15 AM on 06/07/13
from the statement, he was leaving for school because of the hectic schedule, but it didn't make any mention that he was being replaced other than for recording. i think it's a strong possibility he will be back when he's done with school. i hope so, at least.
also, the pledge part happened a while ago now. i wonder how much of the drums they already had planned out, if any, before the fill-in came into it.