I don't think an infiltrating squad would fit their character that well. Trying to honourable, such as being trained in Bushido, does not include sneaking up on the enemy. They seem more like the galant charge across the field type. Those that would infiltrate, or use stealth, would be the outcasts, such as the Greyman. The Kikigome use Stealth, however, they don't come from a very honourable house, and so hence why they can act in such a manor. I know it would seem cool to have an army of ninjas, I don't think it fits with mainstream Mishima warfare. Just my 2c