One story has a different explanation as follows: originally, his uncle Nobukado TAKEDA was to be the successor, but that would be unacceptable for Katsuyori, and so Shingen and Nobukado discussed and decided that Nobukado would adopt Katsuyori's son Nobukatsu TAKEDA and move Katsuyori to Tsutsujigasaki-yakata (Tsutsujigasaki Mansion), and when Shingen died of illness, Nobukatsu succeeded him.
本来は叔父の武田信廉が継ぐことになっていたが、それでは勝頼が納得しないため、信玄と信廉の協議の上で勝頼の息子の武田信勝を信廉の養子にした上で勝頼を後見として躑躅ヶ崎館に移り、信玄病死の際に信勝が後を継いだともいわれる異説がある。