I didn't know that either (even though I recently visited that page, but didn't read everything).
Removing 2 at a time means there was no redundancy left if they both wouldn't cooperate.
I checked it because OgNasty was recently
attacking theymos and
minerjones so I figured there must be something going on. He's very childishly transparent like that.
There was an incident with minerjones being very unhappy with some spam not being deleted on the Collectibles board. Not sure about the timeline though. But this kind of loss of trust surely isn't good for this type of multisig setup.
Og's removal is not surprising albeit long overdue.