According to the genealogy reflected the recent study, their territory was confiscated by the bakufu (Japanese feudal government headed by a shogun) at the time of Tokimitsu TOSHIMA who was a son of Asatsune (grandson in the previous genealogy), and the lineage of Asatsune had ended.
近年の研究を反映した系図では朝経の子（従来の系図では孫）の豊島時光の時に幕府から所領を没収され、朝経の系統は断絶した。