I actually have a very pertinent question related to this. I just not 2 hours ago went through the JP Wiki to figure out all the Disastre raid SRs, and worked out which are farmable and such. I do plan on MBL'ing them, though I'll stop once I get the Assault weapons done (for my chosen element). My question is, is it better to farm them via the 20ap raids or the 30ap ones... or both? From what I understand via my google-translate-fu, they can drop from the 30sp raids as drops, and from the 20ap ones ONLY as the platinum chests (MVP, Starter, Vice-MVP)... Is that correct?

As for the post topic though - isn't the goal to try and MBL everything you can? Your post seems factually accurate - Crom will be impossible because the raid won't come back. Unless I'm missing something?