I guess the only new move that consumes it now is bufu then. 5C went from 800 base dmg to like 1,200 or something. 2C jumped up in dmg too. I don't recall if j.C did, but I'm confident that it might've. Since you don't need spin state to combo into cmd grabs anymore (ala Liz's new j.D combos), perhaps you can somehow do a grounded string into 214214C? I mean, I know the old route is still possible, but you just lose the dmg buff.
This isn't exactly correct. You could, for example, OMB fullscreen 5C with Liz, or fullscreen 2C for that matter. However, it's nonsensical to do it since you would lose positioning w/ Thanatos, and the OMB "comes" from Elizabeth anyway. Some moves just can't be OMB'd since the persona is "in use" per se; another example of this is Aigis' [o]236C/D.