More like "What Nomura thinks of Cloud then/What Nomura thinks of Cloud now" if you ask me.
He's probably sick of people asking for a remake, so when they made Dissidia he was like "aw crap this again".
Also in most cases, in Dissidia, characters were taken out of various points in the stories of their own game: example Bartz was taken out when he mastered his Mime class, Kain, Cecil and Golbez were taken out POST-FFIV, Tifa was taken out some time before she met Cloud again (or at least she doesn't remember him), Gilgamesh appears AFTER he got lost in the rift, etc etc varying points in the respective games.
Cloud is probably taken out sometime between post-FFVII and pre-Advent Children when they put him in Dissidia.