There is a high possibility that the following incident has been fabricated in later generations, when his vassal recommended an attack saying, 'With Shingen's death it is a good chance to attack the Takeda clan,' Kenshin dismissed it by replying 'It is a childish thing to do, even for a person like Katsuyori.'
後世の創作の可能性が高いが、「信玄亡き今こそ武田攻めの好機」と攻撃を薦める家臣の意見を「勝頼風情にそのような事をしても大人げない」と退けている。