rezz is a 10 second cast and most of the time you dont have the luxury of time to rezz and drink up in bgs. a combination of ahnks and rezzes work pretty well if youre in a situation where a few died but you still surivied majority of the opposing side's rush. If it doesnt look like I wont have the time to rezz or ahnk will be wasted, I just stand my ground and wait for my entire group to be wiped out. i also try to release all my characters at the same time to avoid being spawned at different gys.