In my experience -- that doesn't happen. Increases form on the side of the mother rhizome -- and then on the side of the increases, etc. Yes -- it's at the heel end generally -- but at the side of the heel end. And, as time goes by, the side increases move around to fill in the center again until there's a multiple layer with rhizomes on top of rhizomes, if it's not thinned.
Does this not happen to anyone/everyone else?