ayu's album tracks that should've been singles

[se7entheaven]

I'm listening to ANGEL'S SONG and suddenly think why this song wasn't a single. And I'm thinking as well for other tracks that could made better singles. What do you guys think?

For example: for NEXT LEVEL, what if it was rollin'/Sparkle instead or Rule/Sparkle. And (for <miss>understood) what if it's "Startin'/rainy day" instead of Born to be...?

I think some album tracks make better singles than the released ones, plus the tracks could made better PVs.