Heh - I've gone on about the YGO = Kenshin equation before. Can't help but suspect that Takahashi's a fan! (Though actually I cast Bakura as Aoshi originally, due to mutual psychopathy. In personality Kaiba perhaps has more in common with Aoshi, but his role in the story is closer to Saitoh's, so...)
(The other problem is, if Seto = Aoshi, then Mokuba = Misao, and the poor boy's tired of being cast as a chick...)