A good post, even though I don't fully agree with all the commentary, particularly as regards the 'keep everybody' midfield.
Where central and attacking midfield is concerned, we desperately miss the creativity provided in the final third by Eriksen in his heyday, and which has been brought to United since signing Fernandes. We just don't have it, and I'm sure that Mourinho will be aware of that and will want to bring in a player of his own choice, no doubt at a price. Ndombele and Mourinho just isn't going to work, and the sale of Ndombele and Alli probably represents our best chance of raising funds in the transfer market.
As for Lamela, he seems to have found his place at Spurs as a last half hour cameo player, brought in to step up the search for a winner, or hang on to what we've got. He's doing that job very well, and now seems worth more to us than what we'd get by offloading him, given his injury record.
Finally, Sonny has an excellent goal scoring record when standing in for Harry Kane, the real problem is when neither of them are available. I very much doubt whether we could bring in another as a third option who would necessarily be better than the further development of Parrott over the next couple of seasons. Other than selling Kane of course.