I just want to point something out about Domi Reversi.
Remember when Brogy got his hand blown off by Imu's shotgun?
(Chapter 1150)
Well...if you look VERY closely, Brogy doesn't have a hand anymore, after getting un-Reversi'd. There's just a stump there, when we see him from above. Even though, he pretty quickly hides it behind his shield.
(Chapter 1176)
So, remember when Rocks first got Reversi'd?
(Chapter 1163)
He ALSO happened to get stabbed though the chest by Imu's "tentacles".
Imu seems to need to inflict damage in order to "infect" someone with Domi Reversi. And that damage doesn't "heal" after they get out of it.
It's not inconsistent writing. It's just VERY easy to miss.
So...Rocks likely was mortally wounded...by tentacles. It's how he would have wanted to go.