[quote]
Created during a time of feudal war, the school's techniques are based on battlefield experience and revolve around finding weak points in the opponent's armour, thus giving Tsukahara an advantage against armoured opponents that he might otherwise have difficulty fighting.[/quote]

A slight advantage at getting past armour, but mostly it's just a skill to represent his swordsmanship and his status as the style's creator. It's similar to Yagyu's Shinkage-ryuu skill.