I'm in favor of getting rid of the kensai. I spent a lot of time trying to balance this unit, and couldn't do it. The reason is that the battlefield upgrade feature was designed for 60 man units. So, even the hatamoto and battlefield ninja units show some undesirable effect, but the kensai is the worst. A 9 star kensai can kill over 3000 men which is very unrealistic. Also, elimination of battlefield ninja, xbows and ships provides for a stronger tactical game from the AI. There is also a modification of province starting costs available that reduces the economic differential between the northern provinces and the southern provinces which allows greater diversity in viable campaign strategies, and better winning chances for the poorer clans.