It's not just speed. Hendo isn't fighting people as elusive as Machida. Fedor, Shogun, Feijao, they all stand in front of him. Machida's movement is going to be a big problem for Hendo.
Well if you want to go that route then Machida isn't fighting anyone that is hitting people as squarely and as hard as Hendo. Last time he did? He had to be woken up and informed of the outcome. Hendo is also a different animal. Goes both ways.