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And yet it was Londo Mollari (as written by JMS) who took it to the logical extreme: "Only an idiot fights a war on two fronts. Only the heir to the throne of the kingdom of idiots would fight a war on twelve fronts."
Really, as long as there is an unbroken line of people calling themselves "Clan Nova Cat," it doesn't really matter to me if they're still using Iron Wombs or not. They may be dead as a faction, but as a people they still exist. It's not uncommon in the real world, after all.