Age is progressively going against him, that much is evident, but there's still nothing to incite that his cardio has drifted towards mediocrity. It's very possible, but this is the same Randy Couture that has had great cardio throughout his entire career (in his late 30's/early 40's), and only seems to be sharper with age. I could be very wrong here, there are many intangibles that come with a year of inactivity, especially for anyone at his age, but it's doubtful.
If anyone in this fight gasses, it'll be Couture. He's the one whose going to have a huge guy on top of him the whole time. I bet it doesn't come down to that though.
If they were jogging laps,.. Brock is now at an extrieme disadvantage. Randy might be able to jog more laps.