I don’t subscribe to this notion much like I didn’t when others accredited Bale and Modric’s success at the club down to Redknapp.
But if what you say is true is Pochettino also not responsible for the regression in these players? Lloris, Alderweireld, Vertonghen, Ali, Eriksen, Rose are playing well below the level they set 3-4 years ago. Is Pochettino responsible for that or is it just one way?
And why hasn’t there been any other breakthroughs since 2016 if he so talented in this regard? If he was able to progress talents such as these into such star players why haven’t we seen anyone since Son back in 2016 emerge?
Toby, Verts, Rose are clearly getting older and don’t have the legs they used, not changed under Mourinho either. Eriksen wants out and doesn't care anymore, not sure about Alli that is an enigma.
Since 2016 we haven’t had that much in the way of decent signings. Wanyama was great then his knees went, Sanchez was a ok buy and has done reasonably well, Winks was doing well up-to until this season but there has hardly been a decent pool of players since then.
It goes back to the point other posters have made about Fergie and Bill Nic, you have to refresh the squad every 3 years. We didn’t sell or buy enough and it went stale.