I'm thinking United need both, also in case Martnez and/or De Ligt don't remain injury free. Maybe they want to sign De Ligt second, so that this event won't influence Yoro's decision. But on the other hand, if they think signing De Ligt will push Yoro to Real Madrid, then signing De Ligt right after Yoro would be a difficult start of United's relationship with Yoro.i'm quite surprised that Yoro seems to have taken preference over De Ligt. Yoro is very much focused on joining Madrid, but Madrid isn't really interested in matching our fee with Lille. It seems as if De Ligt and Yoro are both targets, but I thought you'd wrap up the one that is very happy to join first, and then try and tempt the hesitant one. Also, I don't see Yoro as a 30+ game starter for us the minute he hypothetically walks in the door. So the INEOS tactics on this one seem....interesting. We need both.
Maybe the worry is, if we sign De Ligt first, Yoro will panic at the thought of not starting games? Whereas right now we can make more "promises" to him in the negotiations?
all guesswork. But I hope we get De Ligt
I suppose the more logical reason is that United can only afford one CB (for now, until sales hallen) and then currently prefer Yoro. (Maybe also because De Ligt had already said he wants United and can therefore wait a bit.)