Know your enemy: AI Buildup and reactionism

[Grond]

An important part of strategy, we all know, is knowing your enemies' basis for troop buildup, troop makeup, and location.

So here are my questions, with your answers based on your knowledge gleaned from hours of playing MTW:
1) Does the AI build up armies on your borders to match yours in size?

2) Does the AI place its high valor generals on "trouble" fronts, or are they randomly sprinkled about? Do the high valor generals seem to be in border states, or is there any sort of organization to placement? What about Kings and Princes?

3) Does the AI use any sort of army sizing and build plan? (I.e. does it build specific units, or is it random?) Are the units present reflective of a sort of survival of the fittest kind of process, where combat eats up the the "poor" units (like peasants) leaving only elite or better units?

4) When attacked in a single province, does the AI typically reinforce, withdraw, fight, and what happens with their troop allocations to surrounding provinces? What formula, if any, seems to be determining whether the AI withdraws rather than fights, and what factors are used for determinants?

5) How does your diplomatic state influence the above? That is, if you are in an alliance with princess marriages, will the AI ignore your troop build-ups? If you're neutral, do they build up more? War?

6) Does the Influence level of your King affect troop deployment by opposing factions? If so, how?

Feel free to explain your answers with pictures demonstrating same, and please, wax euphoric if necessary. I'm very interested in the general overall theories about the AI and how it makes determinations for strategy. I've been paying more attention to what the AI does, and how it reacts, but it seems to me it's not nearly as organized as it could be, and most of the time the brilliant moves it might make are pure accident and happenstance.

Thanks!