I never liked the grey SSJ5 idea. I always imagined SSJ4 to be like a normal form and SSJ5 to be like a SSJ1 form. Like SSJ4 (new normal form), SSJ5 should only have it's hair and fur yellow, SSJ6 should have a brighter yellow and spikier hair and SSJ7 should be like a SSJ3, yellow and with a longer hair. But that's just how I think the AF ssj forms should look.