Haaland and Kane are out of our price range and when you look at other options left in the market for the CF position(Andre Silva, Vlahovic, Daryl Dike) Ronaldo is a no brainer. A direct swap with Pogba is the best deal we can make that suits all parties. We get Pogba off our books to avoid letting him go for free, Juve get Ronaldo off their books to free up their heavy wage bill, both players go back to old clubs where they`d be happy to spend their prime/twilight years at and both clubs solve problems witin their teams(for Utd a prolific goalscorer for Juve a creative midfielder)