>>28949709A hunter, a heel wrestler, and a siren seem more like Moon versions to me, since they have associations with stealth, trickery, and the moon respectively. Sun variants might include a more upfront wrestler for Litten and a dancer for Popplio, although I cannot think of an alternative Sun-variant Rowlett final evolution that still fits with the theme. Perhaps it uses its blade-like feathers as swords rather than arrows and becomes a duellist, but that might be a little bit of a stretch.
If the leaked versions are for Sun, then perhaps we could have a more mystical final form to Rowlett, a quadrupedal ambush predator in Litten, and a darker, more menacing sea creature for Popplio.