Hello.
Since most people here have an expertise on the "RTW subject", I think many should have tried to build "uber FMs" - me included.Before I continue I want to state that I don't have any deep knowledge (game files) just my experience from playing the game.

Let's start our discussion with some possible facts:

- FM development is greatly influenced by his character traits (Sharp, Charismatic, Vigorous, etc)
- FMs have a secret potential value (?)
- The starting Ancilliary (Clerk, Spear Carrier, Family Retainer) is relevant to the career favoured to them (?)
- Could an FM go against his character or ancilliary and become something else (?)
- City government affects development (traits in general) but how
- Battles: the moves the FM orders for his units, his own behaviour also affect his development
- Battles: the type (being on the offensive or defensive), their outcome (eg Heroic Victory) also affects their reputation

just some that came into mind.Please add yours and let's discuss how is it possible (if...) to maximize our FMs' stats.

At least the AI is managing to accomplish that (building great FMs most often), unless of course he cheats which I am unsure of.