Okay so here's a weird one. Just when my dahlias seemed to be slowing down a bit, out pops this yellow-pink cactus variety from the same plant, that back in August, gave me this burgundy dinnerplate bloom.
The dahlia latecomer is on a stem that grows side-by-side to the burgundy one. The resemblance to Aloha in the image below (right) is close, but the coloring makes me think that I've still got something else other than the Aloha. So wish I could identify this!
L-R: Hawaii, Duet, Aloha