The kensai in complete warrior is hardly like a real kensai. This is more like a warrior that has a mystical link with his chosen weapon.
A real kensai, kensei, sword saint, etc would probably be something like :
HP : D10
Class skills : Balance, Climb, Concentration, Craft, Handle Animal, Intimidate, Jump, Knowledge(Local, History, Nobility), Listen, Move silently, Profession, Ride, Sense motive, Spot, Survival, Swim, Tumble.
Skill points : (8+Int mod)
And the class would focus on making you extremely lethal with your chosen weapon, yet giving you high mobility. There is a sword saint PRC in a little known third party supplement, Roleplaying in mythic china, but it is sadly 3.0 and incredibly difficult to convert to 3.5, mostly because a large portion of the class was essentially giving you greater weapon focus/specialisation in 3.0 where those feats didnt exist for a normal fighter.
I would probably throw in fast movement, perhaps some ability to parry a single melee attack per round, give you extra bonuses with your chosen weapon unavailable elsewhere, etc.