I found a nice big oak tree that had fallen down not too far from my house. I cut it up and brought it home to split. I was disappointed to find that the center portion of every stump is somewhat spongy, i.e. rotten... The stumps are about 18 inches across and the outside 4 inches is still nice and hard but the center portion is soft. Is it even worth stacking this wood? Should I toss it in the campfire pile? If I stack it with other good wood will it actually increase the chances of the other wood rotting? (I know that sounds silly since we aren't talking about a virus here but just thought I'd ask).