If you think about it,farm ranking and winning in the minors doesn't make any sense. If you have 20 great prospects they are probably spread over several teams and all are on several different levels of development. (especially when the system is pitching heavy like the Braves) You might have 15 good arms spread over 6 or 7 teams then 5 or 6 bats spread over similar. The rest of the teams are org depth, and boom, bad results.
I don't know if there is any correlation between minor league team success and farm system results, but something tells me there will be none. The farm is about player development, not winning AA championships.
With due respect, I don't think this line of reasoning makes any sense. All farm systems have their better prospects spread out across several levels. But since ours is supposedly better than most, we should have more "good prospects" than other systems to spread around the various levels, thus making our teams better, on average, than minor league systems that don't have as many good prospects as we do.
If a farm system is better than another, on average they should win more than that lower rated system. If they don't, something is wrong.