Top monk is so broad though. Mistweaver, Brewmaster, and Windwalker all have very different playstyles. For example, put me on a windwalker monk. I will be absolutely terrible, miss every single fist of fury, and die over and over. Put some other monks on a spec that they are not used to playing and similar things will occur. I would say that Aoitsaka is the best monk at all three specs. He plays all specs equally ( relatively), and plays them well. This is not to say that there might not be a better individual windwalker, brewmaster, or mistweaver, who would not do well playing all three specs, but would excel at the spec that they play the most.