Ah, understood. Yes, I see what you are getting at. My take is a bit different, though I can see how you can look at it a different way. The Crucible unlocked the Catalyst, basically inserting code into it that allowed the choices before you. Getting the Crucible to the Citadel was what caused the elevator to come down. Prior to that, the Intellect/Catalyst was there, but wasn't going to let you in. There's still all sorts of flaws in that construct though - why the Prothean/Ancient Race crucible required the Leviathan's VI/Intellect/Catalyst in the first place. Of course, while the Catalyst was the collective consciousness of the Reapers, it wasn't in direct control of them (at least that is my take). Harbinger said they were all distinct intellects in ME2. Lots of unnecessarily compicated hookum for what could have been a straightforward situation. I remember seeing the overwhelming majority of people chose destroy, and it does leave the setting mostly intact. I still think you need the Reapers to be gone (at least initially - they always make a come back) in the post setting. If it were me, I'd do more with the reason behind the Reapers because right now it's pretty bogus - other characters investigating the Reaper legacy and how it interacts with the ongoing events. You could do lots with that, and continue to build the story to a more satisfying conclusion.