Maybe a little, but I already thought that was the most likely scenario.
I will say for O'Malley, he didn't look lost on the ground. He was able to get back up a few times and didn't take a ton of damage while down there. I think Sterling is a slightly better grappler than Yan, though, and I don't think he's going to be as willing to strike with him as Yan was.
The key to the fight in my mind is O'Malley staying off the cage. If he lets Sterling push him against the cage, that's a wrap. Sterling will control him there, dump him on the ground a few times, and just methodically beat on him. If O'Malley can keep it in the center, he has a fighting chance.