I don't know what's so HUGE about slapping some texturizer in your hair which looks exactly like what Craig David did. I have seen his hair in videos and photos and it was a lot tighter curl where the ends of that look almost straight.
If your hair has a definite curl pattern (not everyone does) then if you learn to keep it properly moisturized it should curl up.
"More people would learn from their mistakes if they weren't so busy denying them." - Harold J. Smith.