Imbicatus wrote:
Although a Kensai can easily take the whip, sawtooth saber, or the dueling sword, so slashing grace is usable by a kensai without dipping swashbuckler.
Weapon finesse doesn't work with sawtooth sabres, so you do need a dip into swashbuckler if you want dex for both to hit and damage. The sawtooth sabre is considered a light weapon only as regards the two-weapon fighting penalties.