Since most of the issues with raid content stem from people being unable to follow tactics, rather than meeting DPS checks (or failing DPS checks because people failed to dodge/etc and died), I've always thought it would be a fairly... Unique idea, if nothing else, to have Echo work as a ghost mode kind of thing. As in, you wiped, now this time you can see "ghost" version of a previous party that beat the content, letting you follow their movements and so on. Would help people get positioning down for things like t5, which is far more helpful than a solid stats boost, in my opinion.