So they are saying 'here is a red card situation for Manny that has been missed and we can review it' and 'here is an obvious error by the referee that was missed so we can review it' That seems to be what they are saying.
If it was only a yellow for Manny that was missed, then there would be a dozen reviews every week for fouls on Roly alone let alone the other yellows that get missed so they must feel from the footage presented, it's a red. 3 weeks for Manny at a minimum I reckon now. O'Donovan could be in a bit of strife I think.
It might be just a yellow for Manny that got missed. While some on this forum have already suggested it should have been a red for his elbow thing, I have no way of telling either way, so will leave it to the panel. Manny may not have been cited if Roy did not retaliate. I agree that the situation with Roly getting regularly fouled is beyond the pale, and that it goes unpunished drives us easily into conspiracy theories.
Getting back to the MRP, I am more inclined to think Manny only got cited because Roy retaliated. And Manny's hearing will be important also to make sure that O'Donovan's hearing is complete and even-handed, in the anticipation of the strife likely coming his way, as you said. If tomorrow they examine the elbowing and find good reason to give Manny more than one week suspension, then I would not be surprised if on Thursday O'Donovan is banned for the rest of the season.