Cunha overperformed his xG last year as well, and Mbeumo has been good for a couple seasons now. Wissa is good but if he's surrounded by Bruno and Cunha next season I don't think he'll miss him that much.Cunha has massively overperformed his expected goals and Mbuemo is coming off his first great season in 6 with Brentford. And the latter's partnership with Yoan Wissa can't be understated either.
They'll score some goals, obviously, but your suggestion that Man Utd will be in the top 4 on their signing is laughable. I'd be more likely to believe it if they also signed a world class 6 to do all the dirty work that no one else does in that team.
Both of them can add 20 non pen goals to utd next season. They only have 1 game a week next season.