Now there’s a question! If only we could see into the minds of hogs!
Normally they would have a different, more elaborate nest for hibernation. Apart from anything else they might want to get away from any parasites, which may be in their Summer nest – and they do apparently sometimes move nests during the hibernation period. Having said that, an individual hog may decide to stay put. Never say never! But don’t expect it to stay.
Whatever they decide to do, I hope they all have a successful hibernation and come back safely in the Spring.