He would be wasted here, he is a proper football manager that would have to be respected, backed and listened to ... I doubt he would have that here.
We need a yes man
These are managers that are used to working with elite talent, who in some respects manage themselves - i think it's possible (likely in fact) that they just couldn't deal with managing a group of players that were not elite (bar 1 or 2) - just because they are proven at a high level doesn't make them capable of doing the job required here.
Let's not forget it took Conte only a season at Chelsea, with that level of talent, to implode as well - Mourinho as well had a history of being a 2 year manager who by his 3rd season would usually crumble, so both of their paths at Tottenham aren't really out of the ordinary.