Aye and deepening on what Tank you get in Bray, since both Tanks have a skill that reduces damage dealt to them but WAR get there's at LV30 while PLD, 40.

But yeah, if they a good Tank, 1 Mob alseep shouldn't be a problem. Once all other mobs die then Sleep mob wakes up with ton of Aggro on you the solution is provoke, problem solved but at last it all depends on how your team thinks and works.