Pochettino was sacked after 12 PL games last season. Hardly enough time to judge signings like Lo Ceslo or Ndombele.
Ndomebele looked better under Poch's management last season than he did under Mourinho who didn't like him until recently. He scored 2 goals and provided 3 assists while Poch was in charge.
Lo Celso was mainly injured while Poch was there. And it was the same story with Sessegnon who was out with a hamstring injury.
Sometimes you don't get a bit of luck. All three of his major new signings were injured at the start of the season.
Lots of his signings were successful. Davies, Dier, Dele Alli, Trippier, Son, Alderweireld, Wanyama, Sissoko, Aurier, Lucas.
Davinson Sánchez is the biggest flop. He looked very good initially. His debut season.