I do feel like you're overestimating some of those players, though, even if they were on a decent level between 2019 and 2021.
Henderson and De Gea don't get in over Onana, Fred doesn't get in over Mainoo, Hojlund can easily reproduce Martial's 19/20, or Cavani's 20/21 season. We'll surely sign a new DM that can do their job at least as well as Matic under Ole. Greenwood and Pogba are still the only two question marks from this list for me, but I'm probably not taking the latter over Mainoo in the left-sided #8, or over Bruno in the advanced #8/#10 anyways. Also, if we start off the next season with Olise and Amad as our RW options, that's better than anything Ole and McKenna had at United, even though I rated Greenwood very highly, be that at RW or up front. I don't see a world where he stays though, and I would wholeheartedly agree with that decision. Sancho is a question mark, like I already stated.
Our other best players under Ole were IMO Shaw, Maguire, Rashford and Bruno, and they're all still here and they're all still the same players if we put them in that same environment that they used to play in under Ole. The young core is bigger and much more talented now than it was under Ole. All those 9 players I listed + the players we will sign this summer fall into that core.