Careful, some guy already nuked it, despite having plenty of time to beat it. 1hr, 50 min left.
Edit: It's over. Same guy nuked it.
Unless you wanted it dead fast, I suppose you might consider sharing it with Allies only.
Most of the times I want the boss dead fast, so I share it with all, however when its a Unique easy to kill boss like Seed Bearer and such, I go for Allies only.