Probably cause out of all the playeres he was the easiest to replace, especially with Bremer... i also think Bastoni, Barella and Lautaro (guys inter would have to sell to make money) are better. Theres also the thing that Skriniar in a 3 man defense is just not that good. Perhaps if you put him in that center spot, but we didnt see enough of that. Also, for our system, the wide CB needs to be good on the ball, should be able to make runs forward and make good passes. Those are 3 things Skriniar is not good at. He did improve, no doubt, but i dont see him become Bastoni. All in all, he was never the best defender in the league and idk when he was the best Inter defender. Prime De Vrij under Conte was at a level, Skriniar never reached and probably never will, as the only thing he will do in France is stagnate. But, sure he will have a bigger chance of winning the champions league and thats about it. Playing 6- 10 imprortant games in a season wont make him any better.