Problem in a nutshell is Poch started off on his first season at Spurs with Lloris, Vorm Walker, Rose, Davies, Vertonghen, Dier, Dembele, Mason Bentaleb, Eriksen, Kane
Of later additions :
Dele - David Pleat bullied Levy into signing the unknown
Son - Player and agent unhappy that Son not allowed by German club to play at Asian games (to win it meant exemption from compulsory army call up), Spurs took the risk. Son won Asian games in 2018 as captain whilst playing well and scoring/assisting goals for Spurs. Opportunity given to Levty/Poch
Winks - One academy prospect brought through in 5-6 seasons is very poor from the manager.
The majority of teams Poch picked typically had about 7 or 8 players in who were already at Spurs or he had little to do with (eg Dele and Son).
And what that means is that of the 20 or so players signed when Poch was pleased to say he had a significant amount of control over transfers, the vast majority were not good enough to consistently make Poch's teams. Foyth, N'Jie, N'koudou, Janssen, Yedlin, Pau Lopez,, Wimmer, Llorente, or players who played who really arent ideal for Spurs such as Sissoko (and at £30m I'd have preferred to have bought all 3 or Brooks, Maddisin and Grealish for the same money at that time and developed them) or one season wonders such as Wanyama. About his only successes were Alderweireld,and Trippier with 'ok status' for the likes of Mouraand Sanchez.,
Pretty appalling statistics for buying players - total contrast to the squad inherited by Poch.
Good coach, lousy at selecting players to buy- and self indulgent by refusing to accept a DoF