I like the idea about each ingame general as a family leader, which is historically correct, but I'd say all and even the Daimyo should've access to both ashigaru and samurai recruits...
As for the metsuke/ninja, their head could represent a lesser figure, but capable to recruit ashigaru and maybe special units; afterall these individuals had a koku salary given by the clan...
The monk is all set with sōhei units...