As far as ICC, it seems at least for my guys that picking up the battle before the citidel quest or the other one with jousting will force them into the same instance in front of ICC for GY runs. I haven't died since I picked it up, but they are able to follow and see each other out front now for the first time since I raised up my last three shamans as long as that quest is in my log. There are still annoying phase break lines from dalaran to ICC but at least I can send two up to summon the rest now.