I think Aldo's talents and accomplishments kind of work against him. Similar to the way whenever anyone plays Barcelona, they go full defensive. People are onto the ability of Aldo and are changing the way they fight to minimise openings for him. They're fighting more conservatively, and I think Aldo is also fighting a little more conservatively which when the two factors combine make for longer fights.
Velasquez, Shogun, Machida, Condit, Swanson, Cruz,