Indeed, H/P thresholds are usually not that high, and if you follow an army around for a few campaigns you'll easily satisfy most requirements.
Though in this case, Marshal Formations are already tied to leadership, and we should probably keep it that way, even if to just remember that the leadership skill has *some* use. 
Amen! I think I'm the only person I know who has access to all formations. Leadership should be taught in schools! Leadership = Management potential.
