As you, I, and everybody else want to believe it's heartless :/ i don't think they are D:
They always.. ALWAYS carry the heartless mark, But as it looked from that one video from a distance of them Having the Heartless mark it's actually this..
But who knows it could be hiding on they're back.. But if these monsters are heartless what does that mean for the other monsters..
As it looks from these other monsters, They share some what little refference from other Heartless..
And other things like this..
But as it looks if Heartless were in this, I think we would see more notable things it's just that the Monsters from SSBB are confusingly the same with some, But way off from others..
I think that this is the closest right now that looks like it could be related to Kh..