It isn't truly realistic, though. If it were, you'd find all the best officers show up toward the ends of wars, which isn't at all the pattern. In game terms, it's hard to see how the American Revolution produced enough tradition to give Napoleon, Davout, Nelson, Wellington, Blucher, & Suvorov. Just to name a few. And Portugal came out with da Gama, Albuquerque, & Almeida BEFORE she "earned" them in EUIII terms.
There are many such examples.
That's why I made up my own leader events. More trad give you more leaders, & only that makes better ones more likely.
How about Joan d'Arc?
Military Tradition works fine for me. Although what I don't understand is why leaders don't gain skills on battlefield.