Getting De Gea back is still a terrible idea, and I have said this probably a month ago when the rumours first started and saying it again. He is old, he is getting to be 34 or something, maybe more, makes no sense to hire someone who is that old.
Of course he would be much better than Onana, nobody questions that, but if you are a true United fan, you would remember his last year, his reflexes wasn't enough and he was having trouble. He worked hard on the season he didn't play, but then he got into Fiorentina and showed his hard work, but how long will that last? One more season? Two more seasons? I doubt he would do good for a long time, we are not going to see him do much all together, we need to remember that, they need someone younger.