I have never heard a samurai only LS on cerberus. Of course ther could be one but i have been in Cerberus for a year and a half now and havent heard of one. Sorry man
Apart from Beastmaster I don't think there are any LS for a specific job. There were a few that tried to start up but 6 of one job (with the possible exception of BLM) cannot effectively party so they don't tend to last long.