Also, I'd argue that Sancho is equally important to a CB and CDM. Sancho is more than a winger, mind. He also functions as a playmaker from the wings, so that's another outlet. As of now, it's pretty easy to stunt United's attack - close down Bruno, as everything flows through him. What happens with Sancho is more options open up, more creativity in the final third, which can be made use of through movement of the front four. Considering we struggle to break open defenses, its vital.
Not diminishing the importance of a CB/CDM, mind. I'd argue that a proper CDM (Ndidi type) is even more important to freely play Pogba in a CM role. But I'll still be okay with a RW and a CB this time around, if we don't have enough funds for further improvements.
The worry at CB is there is a lack of clear links to CB that we have. Considering there will only be one marquee signing (and assuming that'll be Sancho), then our CB targets become puzzling. Going by rumours, Torres/Kounde would be ~ 60 Mn, as will Varane. I guess Cristian Romero rumours could be a possibility (although I think a sneaky bid for Ramos if he leaves could be another option - not sure how I'd feel about that, to be honest).