Indigo, if I understand correctly, the CG isn't the buffered pivot grab. It's dash forward, dash back, pivot grab. I'm not exactly sure how it works... but in the video marm has in the OP, that's definitely what it looks like too. So, there may be hope yet?
CG, the buffered pivot grab's problem is that it doesn't reach. But the dash forward that marm uses bring you close enough. And the difficulty of doing a "bossnado" is mashing, you just have to do one button a lot and not a sequence of buttons with some sense of timing.
Who does the d-throw dash grab CG actually work on? Never heard about that other than it works on ZSS and that it doesn't work on ZSS.