Lawler is very, very tough to beat by decision. You often have to get him out of there to beat him. While he's had a bunch of close decision wins in recent fights, he is one of those guys who just makes a strong case for the judges because he's tough as nails and knows when to pour on the attack. Condit would have won that fight if Lawler didn't light him up in the second half of round 5. Hell, he wouldn't have taken the belt from hendricks if he didn't stifle the takedown and batter the body late in the fourth and then stalk the hell out of him in the fifth.
People talk about Lawler taking rounds off, but he paces himself in a way that is intelligent. When he goes after the opponent, he makes a very strong case for himself and often does some of his best work very late in the fight which stays fresh in the judges' minds.
RDA is a damn good finisher and has very strong cardio, but Robbie can go 5 rounds as well. My thought process is that if RDA wins, he puts down Lawler in two rounds. Longer the fight goes, more likely it's Lawler's bout.