I love the idea! Let me throw an idea that you may like, or not. Instead of making us go into a specific Strike to kill a boss... The idea behind Rose is that we seek to purify a weapon, right? To bring Light into a weapon that is tainted with Darkness. Well, here´s an idea: instead of killing Xyor (or replacing any other step) the questline tells us to gather X amount of Motes of Light. Yes, it introduces an element of grind, but it prevents the chore of gathering fellow players who might or might not be up for the task, to kill a specific subboss. In any case, I friggin´LOVE the idea! KUDOS TO YOU AND YOUR WORK!