While I can't see your picture clearly, and I've read the same things you have about late summer/Autumn for start of molt, my 14 month old birds, a CornishX (don't ask!) and some "Rainbows" from Hoover Hatchery have started to molt. The poor Cornish is having a hard molt, has lost feathers in identical patches behind/under both wings, plus breast and belly. The Rainbows are going thru a soft molt. Individual feathers stuck up here and there ala "bad hair day / bed head", and bits of spent feathers scattered everywhere. My Comets may be doing it too, but its not (yet?) as noticeable. Certainly, my flock egg production has dropped.
On that subject, has your hen's laying dropped off significantly?
/edit just fed my birds early, took a few moments to really inspect the flock. One of the Comets is molting, one of the Dark Brahma too.