All DPS fails if the DPS go for the Unknowns. That wipes the raid. That's the only downside to the All DPS method that I've seen. Instead of worrying that uninformed or bad DPS players in team B will kill the Unknowns (or that they'll all die trying to get in or after they get in, both of which are pretty darn common when doing the terrible ABC method), you have to worry about there being enough bad/confused DPS in the raid to kill the two unknowns before the good DPS kill all the stomach walls.

Still, the only time I saw the "all DPS" method fail was when only three of us went in. And, when we got out, the tanks were all dead (three of them couldn't tank three wolfsbanes? and Cerberus, with six healers out there...), and the wolfsbanes were roaming around killing all the DPS who stayed outside. Suffice it to say, it wouldn't have mattered WHAT method we used with that group, it was going to be a wipe. But then a bunch of players rage-quit, new people came, and we cleared it just fine with the new people.

So, really, what I'm trying to say is, the speed or wipeiness of the run has little to do with the method and everything to do with the people. If everyone knows what they're doing, five or fifteen DPS can clear the stomach - 15 is faster so you get 15 people back out to kill the wolfsbanes super fast forcing the healers to heal less damage from Cerberus but more damage from Wolfsbanes, or five stay in longer and the ten outside kill the wolfsbanes faster causing the healers to need to heal more damage from Cerberus but less from the Wolfsbanes. Both are totally valid, but I trust 2 of 3 random tanks + 2 of 6 random healers over 5 specific random DPS any day.