I don't know why they filed the 2015 one. Probably to register the ECAB shares (for resale). The $25M loan did happen.
But the 2013 S-1 is interesting. They were also negotiating with ECAB at the time. Perhaps the only purpose of the S-1 was to offer an alternative or make it look like they had an alternative.
We could have a similar situation now, where the purpose of the S-1 is to increase negotiating power.