... for example a sneaky base stealer who does not attempt a steal often but does so successfully when he does. It's easy to give him a very high BR Ability and low BR Aggressiveness, but BR Aggressiveness (to my knowledge) doesn't really affect user-controlled player.
So when such a player is user controlled, he can be turned into a prolific base stealer... which probably isn't ideal.
Who knows what BR Aggressiveness does to user-controlled runners, but if you take the in-game description of the attribute at its faith value, I think BR Ability tries to factor in this effect by reflecting the ability to steal repeatedly, even when the defense is alert.
A high BR Ability player can maintain a relatively high steal success rate even when he keeps stealing and when the defense is alert. A relatively low BR Ability player can occasionally attempt to steal successfully when the defense isn't expecting, but if he tries to many times, he won't steal successfully.
That's just my guess from the in-game description though.

So much for Stroman
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