The timing and age is off. Axel is way older then Riku. As Machinegungeek said, the order process of which he joined is WAY off. Axel is number 8. If Roxas is number 13, he was made in Hollow Bastion, which would mean if Riku's nobody was Axel it would've been way before that and the ages as said just don't match up.
And I shall open up the argument of Nomura wanting a character transition from another game, and basing Reno on Axel, and the whole Ale thing but you probably have had enough of THAT....
And I shall open up the argument of Nomura wanting a character transition from another game, and basing Reno on Axel, and the whole Ale thing but you probably have had enough of THAT....