It's possible, but personally I would not like the Agreste situation to be made less grey.
(On an unrelated note, I am certain she is the one who started Gabriel's onterest in magic.)
If the writers just go, "oh, HM and Mayura are wrong to want her resurrected and their feelings are baseless", it would be taking the easy way out of what has so far had the nuance of a complex situation ~~and perfectly good polyamory headcanons~~.
The series is idealistic, but it's always had the themes of 1) heroism comes at a -cost- and 2) what's good for the group isn't always good for the individual. The heroes will defeat HM- and they should!- but it won't be a bloodless victory. None of their previous ones have been.