Why does roxas has two keyblades

Roxas has two key blades because he is Sora's nobody and since sora's the master of keyblades,he get's two keyblades like he has in his valor,wisdom,master and final form so that means if roxas is part of the organisation xiii get's two keyblades like he's in his in his valor,wisdom,master,and final form!-----------------------------------------------------------------yes the one above is a valid argument but i believe it was for other purposes xion the clone of sora has a keyblade and roxas fights xion i think that roxas has xions keyblade as well i have proof behind this in the last mission of 358/2 roxas walks out with his hood on and he has 2 kingdom keys! They change into oathkeeper and oblivion i think oathkeeper also off the record is the soul of xion and the oblivion is the anger of roxas but that is my opinion