Spurs brought a lot more than 3 players but Kane and the striking position illustrates my point, none of Soldado, Llorente or Janssen were remotely good for him or looked like they fit into the team's gameplan. Sissoko didn't fit and was a flop until 2018 when Pochettino was forced to do without Dembélé. And Son is arguably Tottenham's best signing in the last decade, he is the exception not the norm.
To me it's quite obvious, he is good tactically and a good coach but he also seems stubborn unless pushed into a corner.
Poch didn't sign Soldado did he and he was the main striker before Kane? May have that wrong, but I thought Soldado was there prior to Poch and bombed under the previous manager, Poch then integrated Kane as his replacement.
Llorente was a decent backup and came up with important goals, but it didn't seem like Poch wanted him.
Agree on Janssen
Yes I know they bought more than 3 players, but most of those were not starting 11 signings. There isn't a lot of starting 11 singings made to go off, and then when you add in the fact Poch has stated quite a few times that he is the head coach and doesn't have much say on transfers you see the issue.
Wanyama is another one which didn't work out but this seemed to be due to injury but not sure. I think there certainly is a question mark on signings, but I don't think we want a manager who makes signings, I would prefer a very good coach and a sporting director or system.
Integrating players into the side, plenty of players were integrated, they don't all need to be signings like Harry Winks.
However the main thing for me is that you would really get an idea of player integration after 2018 since thats when Spurs became really an established "top" side in the PL but there wasn't many signings posts that time to evaluate.
I think its fair as an open question rather than something to say he isn't good at. It took a while for him to establish a team at Spurs, and then he didn't really get the backing to evolve it from what I saw. I wouldn't begrudge him for not being able to integrate second rate singings like Clinton Nje whilst working with a tight budget
Davidson Sanchez is the one for me that showed some issue, but over the time I don't expect all signings to work out and I don't particularly see a poor ratio of starting 11 players brought in that he failed to get a tune out of