[ Vanitas groans in irritation and rubs at his face. Of course now Sora would be trying to use his diminutive brain... ]

The one I needed was Ventus, not you. What I wanted to do was to rip Ventus right out of you to rejoin with me. Even then it was just because it was convenient timing. Notice how I didn't chase you down even though I could have.

[ See, it's not that he's actually without logic and reason. Vanitas could have tracked Sora down with some ease. ]

Even at the Graveyard you must have noticed. None of us were really surprised or shocked that you won. It's like it was expected.

So, no. Shoving a Keyblade in your back wouldn't have served me at any point.