I think Aldo and Barao have slightly different styles. There's a difference in fast twitch muscles, their movements, combinations, etc. Barao leaves himself opens at times, and fights flat-footed. Aldo is much more agile and very quick off the draw with more precise, and brutal combinations. Even while Dana thought Barao was higher, Aldo will still remain #2 whether or not Renan lost that fight.
McGregor is taking that belt...probably similar to Dillashaw's performance tonight