Focusing on Koyo Gunkan (record of the military exploits of the Takeda family), however, Kuroda determined that 'lapses of memory were seen, but the stories are not maliciously fabricated; this is a historical material of good quality based on their experiences.'
だが、黒田は甲陽軍鑑に着目し、「記憶違いはあるが、悪意の捏造はなく、体験に基づく良質な史料」と断定。