De Gea's saves are more reliable than Onana's, the Red Devils need a good goalkeeper like De Gea. Onana has been tried and it is not possible to say that De Gea is good either. I think De Gea's departure was a mistake in the first place, he left the team because he did not fit Eric Tan Hag's game plan, this goalkeeper was always good during his time at United, it is interesting how he did not fit Eric Tan Hag at that time.
I do not see De Gea coming back to Manchester United as very likely.
I never believed De Gea departure was a bad one, people are considering it as a bad one because they have seen when Onana can do and they realized De Gea was better. Just because De Gea was better than Onana, doesn't mean his departure was a bad idea, that is not the case at all. They should have fired De Gea and they did, but they should have hired someone better than Onana and they didn't, that part is the wrong one. If they end up getting De Gea back, that would be a huge mistake.
They should find whoever is the best goalkeeper in the world that is under 25-26 years old, they need to get that player and put it at goal, and they should get someone like Osimhen at the striker and that is it. If they spend 75 million on Osimhen (release clause) and another 75 million on goalkeeper, that is enough for next season. Let the rest be the same and try again.