This is because Yoshitatsu was born in 1527, and his mother, Miyoshino, gave birth to him within a year since Yorinari TOKI gave her away to Dosan.
義龍は大永7年（1527年）の出生で、母の深芳野が土岐頼芸から道三に下げ渡されてから1年以内の出生のためである。