Nah, Thurman is gonna run the whole time while trying to catch pacquiao with a hook coming in. The only way keith gets knocked out is if he hurts pacquiao and gets caught being too aggressive.
I feel like they are meeting at the right time for a good fight. Pac has slowed a bit at 40 and Thurman is still getting rid of considerable ring rust. Prime Pac likely beats Thurman, a peak Thurman beats old Pac so this is a good time for the two to meet.
That's how I see it too. On recent evidence I agree with @Oakland Billy Smith that Thurman looked a shell of the fighter he once was, if he's not managed to get himself in better shape than even old Pac should beat him.