The following rulings apply to "Great Shogun Shien" and to all "Six Samurai" monsters that have an effect like: "If this card would be destroyed, you can destroy another "Six Samurai" monster you control instead."
These TCG rulings were issued by Upper Deck Entertainment and have since been deemed unofficial by Konami. They were previously considered official, but may or may not necessarily hold true nowadays.
↑The Ruling means that those Rulings apply to all "Six Samurai" monsters with the effect "If this card would be destroyed, you can destroy a[nother] [face-up] "Six Samurai" monster you control instead.", and "Great Shogun Shien".
↑Konami FAQ: When you control multiple "Six Samurai" monsters and "Torrential Tribute" etc destroys all of them, can the substitution effect be applied?
↑Konami FAQ: If "Majestic Star Dragon" negates "The Six Samurai - Yaichi", then can you apply the effect which destroys instead?