I'm not sure what time Third's been doing their WoD runs at but I can say that I have never seen anyone even suggest the ABC method. It has always been "All DPS In" every time I've gone through that raid.

The only time I've seen it fail has been 1) someone not chaining in time, 2) OTs aren't grabbing the Wolfsbane.

On top of this there have been plenty of runs where I have not gotten to the second belly stage. The fight was over by then.

Can I make any comparisons about which is faster? No, obviously, because I've never even seen someone suggest anything other than "All DPS In".

To be honest though, it does make sense to stick them all in. The damage is negligible inside because the DoT doesn't get the time to pick up. Unknowns can be safely ignored (if necessary, pop Second Wind, those things hit like warm towels). There are fewer Wolfsbane out (I've seen as few as two, one of which died thanks to tank DPS nearly as soon as DPS were out of the belly) as well.

Regardless... At the end of the day it all comes down to which method the people you're playing with are most familiar with. And yes, communication is something that is very poor across the board and needs to improve. Otherwise DF 24 man raids will always be light on mechanics/tuning.