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Drunkskunk (Sin) - Petridish (ToS) - Gwarnath (BS) - Tomatohawk (DT)
That used to be true but they ninja fixed it.
However yes once Cloud is open you can farm it with all your characters (so there's several Cloud runs every week but still only one per character) and the real problem is that it's far too easy for a 24 men raid and 8-10 decent people are more than enough and the rest can be blue geared offline levelled alts (hence why you see those fresh toons wearing the OP blunt and rings and ****).
Expert Shield of the Risen opener.
There are some guilds who, as a matter of course, try to find exploits and shortcuts to gear blue-geared toons with top level gear. They managed to do it with T4, even inviting anybody from global to to farm MC bosses.
That's one of the things the devs think about when creating a new mechanic. This one could be well-exploited from the sound of it.