Considering the fact that there was a record of Yasutsuna in Azuma Kagami (The Mirror of the East) stating that his official rank was Shurishiki (Office of Palace Repairs), which was equivalent to Junior Fifth Rank, Lower Grade, around 1230, it is presumed that he maintained that rank and was eventually appointed to the governor of Shimotsuke Province.
泰綱が吾妻鏡に登上する1230年頃の官職の記述が従五位下相当の修理職となっているから、下野守に任ぜられる前の1230年頃には既に従五位下の官位を余されており、その官位のまま下野守に任ぜられたものと推定される。