Hugin and Mugin (Odins racens) state it directly
"“Easy there, ladies,” I said. “Or we’ll find out how well you operate at absolute zero.” Two heads tilted sharply. “The Winter Knight,” M said. “At the weakest portion of the seasonal cycle,” H noted. “Fifty percent chance he neutralizes one of us before termination.” “Conflict with the seidrmadr results in approximately a twenty-five percent reduction in the principal’s personal defenses.” “Unacceptable,” said M. “Unacceptable,” agreed H."
So mainly I just wanted to say wauw. Also Harry's comments about him being a very strong human, but stil normal human strength total denial from his side because he don't want to be in the monster category.
So maybe the wrestling book will be at mid winter? I am still waiting for a fight with winter claws and armor :-)
Also, so h&m are half Odins personal defences. Maybe that is a hint we will soon see his wolves Gere and Freke? Where are Gere and Freke now? Watching Odin's extra body at home or something?