That seems a bit strange to me. That Hercules would delay much in coming to Asgard's aid. Not that he and Thor have always been the best of buds but they are usually friends. And given his desire to test himself this would be something I imagine he should come fairly quickly to help Asgard if needed.
Have to wait and see. I doubt Thor would overpower Hercules fairly quickly. As far as I have been able to tell so far the unique thing about Jane is that the hammer is doing more for her compared to classic Thor.
I guess we just have to wait and see.
If Jane pins him down righ at the start, she is ineed earths strongest hero!