I think we should prioritize Aouar over Locatelli (we can always close with Sass later on). Lyon are probably in more need of money than Sass, and Locatelli isn't worth a lick over 30 million.
I do believe that if we go in with an offer of a 20 million loan + obligation to buy (30+ bonuses) Lyon will accept, especially if Aouar wants to come here and is convinced by our project (Having Pirlo and CR7 also helps).
McKennie is a decent option off the bench, and he's quite young, so it's a win win, especially considering the figures being mentioned.
I am sure Pirlo is aware of how much the midfield needs to improve (after all, he was a midfielder and was part of the best Juventus midfield since the Lippi era).
Arthur, Bentancur, Aouar, Rabiot, McKennie and Locatelli/De Paul is a young and dynamic midfield.
Get rid of Higuain, Khedira, Turdeski, De Sciglio, Rugani - Costa and Ramsey if possible. With those players being sold, I'm sure we'd have enough money to go for another RB and a backup striker (perhaps that young kid from PSV, or bring Kean back).
Next summer, go all in for Zaniolo.