"You're a third rate duelist with a fourth rate deck!"

Yeah, some of the things Kaiba in the original manga never get mentioned again. For example, when Kaiba uses his three Blue Eyes White Dragons for the first time he mentions that got them by either economically ruining or physically threating the original owners. He also mentions that some of them commited suicide afterwards. That's literally the one of the most fucked up shit the character has ever done and neither it or the fact that he almost killed Yugi and his friends in the manga ever gets brought up again, because Atem mindcrushed him once.