I hate to say it, but yes, I would ask that any rigs or animations that were used for models in an entry to this jam be made available on OGA by the Oct. 31 deadline. I'm sorry if this makes a particular OGA model hard to use or indeed even make your entire project in-admissible to the jam. I'm not familiar with the licensing terms of the sources you mention, but if they don't allow you to re-distribute the assets under one of the OGA supported licenses, you'll have to find an alternative of some sort to use instead. I know that might make it difficult to use many of the 3D assets on OGA, but it only seems fair for the 'All-OGA' game jam.