It's tempting maybe to figure that Espana's height and long arms win here, as they did against Taylor. But you know Porter is going to get inside that jab. What happens?
Funny that this might be the first time I've seen Espana in a MM. He was a quality fighter, and I'd pick him over a Porter/Thurman level guy.
I don't think Espana did enough in his career to justify being favored over someone like Porter. At best, he's an unknown quantity.