I don't think the managers who just bought a new talent want their opponents in their league to see his skills. Should this be implemented they could.
Now those opponetns only know the skills (if they remember them) when they accidentally saw the player on the TL, and rememeber it was him, which doesn't happen too often.
I dare say that in more than 90% managers from the league will not have been looking at the player the manager just bought...
They are not your friends; they dispise you. I am the only one you can count on. Trust me.