this is not how the whole non-eu player deal works - a team has the right to one non-eu player to "register" with the federation, whether that player is on loan or bought fully, it doesn't matter.
And as many as the team wishes if the non-EU players are taken from another team in the league. This is why Genoa bought Prince so that they can loan him to Milan, that way Milan can still buy another non-EU and they bought Robinho.
Boateng had to give up his German citizenship when he decided to play for Ghana.
Dude, stop defending your filthy doings of your club.