both Lyse and Raubahn decide to finally do something about it. We may have influence over their decision but ultimately it's their decision. Supporting it is no different to Alliance considering to follow through with them, we're still their friends. Any other npc with echo has same success rate as us, because the adventurers team that progress through the instances is logically the same just with a different leader. I wouldn't underestimate Urianger's preemptive prepareness or Y'shtola's determination, without them we wouldn't be able to counter artificial echo or survive Zenos first 2 fights.