This is what I was able to come up with, I don't know why the bones deform on imports. I couldn't get mixamo to auto rig it, so here is the blender rig I had worked on previously, as well as the next attempt. On import into unity, I think if you use the rigging button/tab (when selecting the fbx from the assets), you can create a rig of the model in unity. It looks like it might be ok to work with in unity, but I dont think you can directly rig in unity. Sorry for the delay, at my wits end with this one, been going at it for at least 8 hours now