I was trying to help my son run threw the failsafe echo story so he could get the choir of one and he got so confused as to what quest to run he eventually gave up.
He would complete a step and the game would then mark a quest step from the dreadnaught echo so he would go do that and because I've finished the failsafe echo story I don't know what part of any mission he is on I got to say it sucks to try and play with someone who is playing catch-up only because if you join their game and they have locations marked on the map you don't see or know where they are it's just so stupid
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Once the new expansion drop the exotic mission should go into to rotator.