[Edratman]

Probably the biggest factor on the AI troop mix is the number of castles it builds and/or discovers by site search. The castle build rate appears to be based on a very low probability dice roll.

If the AI has only one castle, which is very often the case, then no matter what mod or version you play, the AI will have to fill out its forces with indys and the low level summons the AI uses. If you use Edi's BI (any version), then because of restricted choice the AI will be better. But these will never be as good as national troops it can get from a castle.

I've made mods where AI castles were the lowest cost one on the list for 1/2 the nations of a circa 40 nation game. The castle build rate between the two groups was the same, indicating that castle cost does not enter the AI decision making process.