Uh... You do know that's a whole lot of BS made up during WW2 right? Bushido was a loosely followed code, much like Chivalry. The first thing Samurai's were trained in was the bow, followed by a pole arm. The sword's were side arms, meant as a last resort.

BUT if we want to follow that line of thought, give them a front positional. If they're going t be wearing heavy armor, why not make it worth it? Hell Ninja's sneak attack is a front positional.