Only if you MS, and that's once per run. We've been slightly altering our strategy as we found that we simply kill too fast after it splits. The typical strategy is to shock it right after split, then shock it again near 25%, yet we kill so fast that it's often at 10% or so when it comes out of squall. So instead after split we're telling our SMN's to wait a few more seconds then shock it so that it lasts throughout the <25% phase.And WAR+Reso absolutely destroys this mob. 20k damage in a matter of seconds is nothing to downplay.
Got 10 marrows last Sunday but had two wipes due to implosion followed by quad split.