Neither of us were there. So we don't know the extent of such situations. He may have been vilified by those who kept record to seem so being he was an outsider. We all know Japan was super isolationist at this point in their history.
Everything is extremely simple, if you are a samurai, follow the code to the very end, because there is an expression "The Way of the Samurai", and only one thing is clear in this path, namely, the final of this path.
You don't have to be there to understand the situation. Just read, dig deeper and you will understand that it is not enough to be able to swing a sword to be a samurai, there are very strict rules, look at the hands of the yakuza, many of them do not have enough fingers on their hands, which they cut off on their own as an apology for every fault in front of your boss.
But you know that because it's currently present. History of an outsider in Japan is as the Europeans have done throughout history. The good ole white wash.
I'm not saying he didn't disgrace the title. I'm also not saying he did. I was just presenting it as I know it. Nothing more, nothing less. I do not know everything.