Well to me disappearance has to do with account is not ban (partially active) so there merits are still usable, while the ban account why I noticed some of their merits aren't being reverted is that sometimes such person could have chances of gaining back their account if their cases are clearly reviewed and they judge it, when they noticed the owner still have chances to get back his or her account, at the cost of restoring back the account they won't lose their merits. But however, ban account may not have that power to send out their smerits, I think only those they had issued a temp ban can be able to attest to it.