Heh, well the connection I was going for was (aside from being a certain strength) in DBZ the characters generally don't achieve Super Saiyan without being backed into a corner and/or experiencing a very traumatic/upsetting event.
Though Garrosh is doing a lot of morally questionable things, based on what people have pulled up so far it doesn't look like he actually resort to empowering himself with Y'saarj until the heroes have confronted and battled him and he sees defeat as inevitable.