I will try to explain this failure just taking Sissoko as an example...
May 2016 - Mane comes to Spurs training ground ,very much open to move & play once again with Poch. We offer him 80k he asks for 130k a week. We drag it on hoping he will sign for Poch
June 2016 - Liverpool swoop in him and give him a salary of 110k a week and pay transfer fee 30m + 6m addon
31 Aug 2016 - After fuking around for the entire window, to appease Poch, Levy signs Sissoko on last day of window for.... 30m fee giving him 80k a week
In essence, we lose out a player who our manager desperately wanted to a rival who was finishing under us....because we were trying to squeeze out 1 to 2m from his wages...
Fast forward 5 years, Sissoko walks away on free transfer winning nothing....and giving away that pen in CL final to very same Mane.
On otherhand, Mane wins EFL cup, FA cup, PL , CL , Club world cup...and then gets sold to Bayern for 27m....
Failure of these transfers all have 1 underlying thing : We fuck around trying to penny pinch and let good players go to our rivals and then settling for 2nd or 3rd choice...who mope around for 4 years and go for less winning nothing....