Wolfox

All of the Legendary Six Samurai are young versions of some of the first ones, and they all have minor backstories to how they got that way. It's really cool.

Kizan - Grandmaster (Promotion)
Kageki - Chamberlain (Lost his arms)

Shinai - Spirit  (Died)

Mizuho - Hand (Became a spy after her husband's death)

Enishi - Enishi Shein's Chancellor (Still active)

Shien's Advisor - Elder (Retired) 

Kagemusha also bears a striking resemblance to an extremely old card, Kagemusha of the Blue Flame, and they're speculated to be the same person (and also Shadow of the Six Samurai Shi En after the first Shi En's death).

I know that and that the Six Samurai have enough lore to build an Anime around them. but I just never put 2 and 2 together that Kizan and Grandmaster were the same.

Somehow I did know that Kagemusha of the Blue Flame is the same as Kagemusha of the Six Sams, as that's a bit of a retrain. and that Shadow of the Six is, iirc, said Kagemusha to make sure the Great Shogun Shien isn't assassinated