10 windows, 23 signings and only 3 (Toby, Dele and Son) of them genuinely went on to improve the first team.
This is beyond poor, can't think of any top team done this worse.
Here's the side that played our home first leg against Benfica the year before Poch, essentially our last hurrah at a trophy that season (We lost 3-1 and Sherwood played a weak side for the return leg...for some reason)
Kane, Lloris, Vertonghen, and Eriksen remain in our team.
Toby, Dele and Son are massive upgrades over Kaboul, Lennon and Adebayor, as you said. (Sanchez deserves a shout in this group as well)
Trippier and Aurier are collectively nowhere near Walker, fair.
But you're trying to tell me that Davies, Dier, Wanyama and Sissoko in some combination are not a massive improvement over Sandro, Paulinho and Naughton?
I strenuously disagree.