BobCo hit it on the head... more often than not, rubs are just random happenings in the woods that let you know a buck was there... past tense emphasized. Now, as he said, if you can find a line of rubs, you may have hit on one of that buck's key travel corridors... and that's where I'd be hanging a stand. But never hang a stand over a solitary rub expecting him to come back to it.