As for the first two goals, if Pope and Onyewu sandwich Koller on that first one, then the Czech probably wouldn't have been able to head the ball with such authority. On the second goal, Rosicky doesn't score if Onyewu doesn't put the ball right on his foot in a spot where he can take a free blast at the net.
That's my point. Not much Keller could do about those goals.
To add...if Onyewu doesn't pick up an unnecessary yellow card in the 4th minute, then he can actually body-up on Koller without worrying about picking up his second.