I agree-- and Rowling makes such a point of keeping his body separate from everyone else, not giving him the honor of being placed next to the heroes of the war. In the movie, his body could land anywhere.
So you've taken the Pottermore sorting hat quiz multiple times, just to make sure it put you in the correct house.Surely you can't be in Ravenclaw. you're a Gryffindor! Or maybe you KNOW you're a classic Hufflepuff, but the darn hat says otherwise.