In "Keizu sanyo" (pedigree charts of Edo period), it said he was born in 897, and he had Mitsunaka when he was fifteen years old if this theory is correct and it seems this can be appropriate, however it was unusual if he was not appointed as goi (Fifth Rank) when he was over 40 even though he was the second generation of the Minamoto clan according to this.
系図纂要には897年とあり、もしこの説が正しければ15歳の時に満仲を儲けた事になり妥当にも思えるが、今度は、2世源氏でありながら40歳をすぎても五位にも叙せられなかった事になり不自然である。