one other hint if all else fails,
(in the sam mod there is a new heroes.txt file) try forcing the startpos file to use the default_hero file (and rename the samurai heroe file TO default_hero - or however it is spelt)

let me know if that solves the problem
(ALSO make sure all kings names also appear in the names file in the correct faction list)

let me know,
cheers,
B.