Mushanokoji-senke was referring to the school founder Soshu (ICHIO) as the fourth soke and the second Soshu (BUNSHUKU) as the fifth soke but in recent years the lineage became synchronized with that of the other two Senke to refer to Rikyu as the original soke.
武者小路千家では初代一翁宗守を四世、二代文叔宗守を五世として数えていたが、最近は他の二家に合わせて利休より代を数えている。