Because he is just memories of Sora, not half heart of him.
Roxas was "made" when Sora turned into a Heartless, towards the end of KH1
No. Roxas is the nobody form of Sora created when Sora sacrificed his heart to save Kairi. When someone is turned into a heartless, the empty shell left behind is born into a nobody, and in this case; Roxas.
No. When Sora was turned into a Heartless, Roxas was created as Sora's Nobody. Roxas is the shell Sora left behind when he was transformed into a Heartless, even though Sora later got his heart back. So Sora is not Roxas's Heartless; Sora, to Roxas, is what's known as an Other. An Other is a Nobody's original self. None of the Organization XIII members have an Other who's still alive; Roxas and Sora are a unique case.
Roxas isn't Sora, he's Sora's Nobody.
No sora is roxas, well roxas is half of sora, because roxas is soras nobody.
Roxas went to be his part of Sora if you played KH1 you would see that Sora turned into a heartless. When that happened he was strong enought that he also produced a nobody: Roxas. According to Naminie Roxas was needed to make Sora whole.
Roxas is Sora's Nobody, so Roxas was referring to Sora as Roxas' "other" part or half of Roxas.
Roxas reawakens Sora by returning to him. Sora regains his memories from Roxas, since they had been in Roxas while Sora had been asleep.
Roxas is Sora's nobody. If you take out the x in Roxas and unscramble it, you will get Sora. Ventus' heart was absorbed by Sora soon after his battle with Vanitas inside their fused heart. It is because of this that Roxas looks like Ventus.
Roxas is Sora's nobody remember? So Roxas has memories of Sora and Kairi being together.
nothing but its roxas's (sora's nobody's) town where roxas grew up but it means nithing to sora.
Roxas was created when Sora stabbed himself with a keyblade. So, he is Sora's nobody.