From the Race Policies tab on RunDisney.com:
"If proof of time is not provided by the Proof of Time deadline (see Event Section Proof of Time Guidelines), or if the data provided is incomplete or cannot be verified, you will be placed in the last start corral. No corral changes will be made after such date."
From the Marathon tab under Events:
- "Proof of time must be provided from an officially timed race on a USATF certified course reflecting results between January 1, 2018 and October 8, 2019 and must be one of the below listed distances. Runners will be placed in the last corral if the appropriate race distance is not submitted for Proof of Time or if the data provided is incomplete or cannot be verified.
and
- If proof of time is not provided by October 8, 2019, data provided is incomplete or cannot be verified, you will be placed in the last start corral"