USA SWAT Team super admin Fever is also one of the leaders of Third Echelon T3 clan, under the nickname Whelen. While changing his status to "AFK" in US, the 300-ping Indonesian actively runs T3, posting regularly on their forums and occasionally appearing on server.
Although an acting leader of US claims he knows this information, he also had said 8 months ago that "in US we don't allow people to be in more then one Swat-clan". So either there is no consistency or the identity of the double-clanner was never really known until now. SWAT 4 is dieing and topics such as double-clanning may not seem as important now, but for people's interest this is shared.