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Friendly reminder that Iguro was saved by Kyoujuro's father, which could mean that he had known Kyoujuro since they were young.
Senjuro probably grew up being close to Kyoujuro, Mitsuri and Iguro, as the three are Hashiras and got along well with each other.
Friendly reminder that Senjuro lost them at the end.
P/s : I actually want Senjuro to take care of Iguro's snake but oh well.