Since he does not appear in other documents from the same period, Minoru NOGUCHI argues in 'TAIRA no Koremochi and TAIRA no Koreyoshi' in "A Research on Togoku Samurai in the medieval period" that he is the one and the same as TAIRA no Koreyoshi, who was the son of TAIRA no Kanetada and Chinju-fu shogun (Commander-in-Chief of the Defense of the North).
それ以外には同時代の記録に見えないことから、野口実は『中世東国武士団の研究』「平維茂と平維良」において平兼忠の子の鎮守府将軍平維良と同一人物と言う説を展開している。