As a rule, we should refuse to do these kind of deals with the fat mobster, when we are held hostage to his 25% piece and to his pressure to sell the player.
But exceptionally it is something we must do. Pogba is the utmost example. Kean is the next on the line, and honestly, Pogba already opened a precedent. If the fat fuck demands this for every player he has, fuck him. Avoid his players like the plague. But eventually it is worthy, when we are talking about huge potential.
And Kean is one of those. You be sure that Raiola is pushing the kid to go away for free, but his parents are set in Italy and don't want to let him go. We refuse to insert the 25% (or higher) comission percentage in the contract, and everything is stale. And the kid keeps playing and banging goals.
If we have one world class potential in the youth ranks, it is Kean.