Sorry maybe I’ve misunderstood your stack. The “typical” plex_debrid stack has the debrid mounted via WebDAV using rclone so plex/jellyfin/whatever can see the stuff on your debrid as though it was a local file, only downloading bits of each file as they’re requested.
The option I suggested lets rclone download to your disk as a cache, which I found mae the experience much smoother
They dont. You can ask them though, at least in my country (UK)
You’d be lucky to get breast though. IIRC from the time I worked there, 2/14 pieces are breast per chicken, and if people specify, they usually want breast, so there aren’t many left.