Tholals mod has the warrens extend XP bonuses (and other bonuses) to the extra unit, unlike vanilla FFH2 where the extra unit is excluded from those starter bonuses. How much of a help was that?
I played the Clan recently and it was pretty cool to start out with 2 level 3 units right out of the warrens (apprenticeship, Form of the Titan, and command posts w/ the charismatic Shelba).