Why can't Mickey call up a corridor of darkness?

[Regret]

See: Secret Ansem Report 2

While heartless and beings without hearts use corridors of darkness, It is very dangerous for those with hearts. Because darkness corrodes the hearts.

Of course I'm paraphrasing a bit.

 

[#1 Xemnas]

this makes me want to cry. seriously? pay attention, and read some. mickey is not a user of darkness, nor did he give in to it. the keyblade makes no difference. or else, he would have been flying all over the place, not needing sora at all.