We run 2 raid groups, 8 man and 16 man, and have been killing these guys on both since the first week of 1.2 on live, and also in both operations on the PTR for weeks before that.
We have never had someone get the debuff who was doing what he was supposed to be doing. Ever.
It sounds to me like your sorc doesn't want to admit he messed up and is trying to blame it on a nonexistant bug.
So hardpeck do you agree with the forum opinion that 8 man is harder?