It seems if you beat someone hard enough you with enough haki you can cut their link with Imu. Roger and Garp did the same to Xebec
That's how Dorry and Broggy will be saved imo
So, I believe Domi Reversi is Shadow based. It's more or less Imu putting your Shadow, your "negative side" in control of your body.
The Harald stuff is different, Harald was still himself, just his mind/body were beholden to Imu's orders (if Imu had wanted Harald to destroy Elbaph, he would have most likely Domi Reversi'd him. But, Imu wanted Harald to rule Elbaph, so, he went the less destructive route).
Domi Reversi is literally turning you into a Demon by overflowing you with your own negative emotions. IMO, it's like Goldenweek's Color Trap amped up to 11.
We've seen Luffy grab lightning before.
I'm wondering if Luffy in Gear 5 can like, actually pull Shadows off of people. Maybe even pull the Abyss Seals off, the way his scar flew off from Warcury's CoC Roar in Egghead.
Can Luffy just... grab Dorry, and flip him back over with a suplex?