As I have said before - and where I partially blamed Pochettino - is that this Spurs-side is completely unbalanced. You remove Son and Kane and you have a squad which isn't much better than Brighton, Burnley, Southampton to mention 3 random clubs.
Lloris is still a quality keeper - but at the age of 34 - why would he sign a new contract in 2 years time.
Their defense is simply awful - Sanchez came to Spurs at the age of 21 - and 3 years later he hasn't convinced me at all. Dier is not good enough to play in defense. And the 2 players who are (or were) good enough Vertonghen and Alderweireld are 33 and 31 respectively. Add to that they have mediocre full-backs in Davies and Aurier. They have Sessegnon who is still young but he never impressed me as a fullback at Fulham and is more likely to have an impact as a winger
Lo Celso has been good, but not good enough compared to Fernandes, Fabinho, DeBruyne, Pogba, Henderson etc. Sissoko is one of few who has actually improved over the last 18 months - but he turns 31 next month. Winks is ok but at the age of 24 - he will never be good enough to challenge the absolute top players - and the less said about Ndombele the better. Moura has never been consistent and has a poor season behind him - and add to that he turns 28 in a month and is not likely find that consistency he never did find before. Lamela at his best is quality but he is also inconsistent and his end product isn't good enough. 16 goals in 150 matches for an attacking midfielder isnt exactly good.
Bergwijn escapes a lot of criticism because he has scored a few important (and very good) goals - but the fact is, he has scored 3 goals in 12 matches for Spurs - but he is just 22 so he can of course get a lot better. Dele Alli has improved a lot this season compared to last, but in my opinion he is nowhere near the player he was in the 16/17 season where he looked like he could become a world-class player.
And this is basically what Mourinho took over - a team with so many obvious flaws that it will take 3-4 transfer windows and a lot of money to fix. The biggest mistake made was that Spurs gave this job to Jose who probably could fix it if he was given a lot of money - but he was never gonna get that at Spurs. As a minimum he would need 3 new defenders and at least 1 central midfielder of high class. But one of Spurs' major concerns is that their 2 best players are at that age when you either sell them - or you accept that their value will start to drop because of their age. (Kane and Son). But even if Spurs decide to sell them, the corona has practically stopped a potential transfer because no one can afford what these players were worth 6 months ago before Corona. But how long will especially Kane, but even Son accept being part of a club in a negative spiral ? Harry Kane could easily become a glorified version of Matthew Le Tissier who is lauded for staying faithful to Southampton all his career - but who had no medals to show for it - who never got to test himself against the best. Kane of course has played a lot in Champions League, but I can see it happening again at Spurs in the next 2-3 seasons. And Harry Kane strikes me as a very ambitious player who wants to play against the best - so I can see him and his agent having a talk about the future, as soon as this season ends.
So Spurs in reality can't raise any serious money because they have no real sellable players - which in turn means that Spurs maybe can sign 1-2 quality players at best - or be smart in the transfer market and find some cheap, quality players - which is not Mourinhos style.
In my opinion - there is no doubt that Mourinho will resign sooner or later - most likely sooner, and he will leave Spurs in a bigger mess than they were before. They have failed miserably in the transfer market over the last 3 or so seasons - I would say they have been worse than United, partly because they have had less money to spend but £130-140 million for Bergwijn, Ndombele, LoCelso and Sessegnon so far - not a success. The season before they spent nothing - and in 2017/18 - they spent £100 million on Sanchez, Moura, Foyth, Aurier and Lloriente - that was basically money thrown right out the window. And the season before that they forked out £70 million on Sissoko, Jansen, Wanyama and Nkoudou - where only Sissoko eventually proved to be a good (if not great) signing. So Pochettino deserves a lot of criticism for wasting hundreds of millions of pounds in his last 2.5 seasons at Spurs, and Mourinho was never the manager to rectify that situation.