I'm leaning in this direction myself.

IANAL, but I think about the Feist Publications ruling which dealt with raw listings of facts (white pages names, addresses, phone numbers organized in the most functional format - alphabetic.) SCOTUS ruled that the raw data was not copyrightable even though it took a lot of effort to collect and compile it. It seems to be that the raw data here are the weights which would make them not copyrightable. The structural design of the model might be, and more than likely the compiled model with weights would be copyrightable.

I suspect this will work its way through the courts just in time to be rendered moot.