Thank you to this wonderful community for all the s'cap memories! I will be traveling to Ft Myers to visit the nest this weekend and bring closure on this amazing season. If by some blessed stroke of luck I spot and can confirm M15, I will report back.
Twice in the past month I have photographed a young juvenile in proximate locations looking over Lake Okeechobee, with a beak and head feathers similar to E22, but no squees, so I doubt it's our E.
The good news is that the juvie seems to be thriving, and brings hope that E21 & E22 are thriving as well.
"You carried the weight so we'd have a good life