I'm glad his caudal penduncle looks normal.
I have no real idea about the fin though, no real experience with crowntails. I only have one crowntail and I rarely see his fins flared out normally because he's handicap and scoots around on his tail. Does the ray look like it's curling in or fusing? Or does it look like it's just clamped for some reason? Except for the parts you indicated in the photo, Flambé's fins look pretty normal to me but as I said, I'm no expert with crowntail fins. He looks very handsome, though.
These bettas, they do like messing with our minds, don't they?