She pushed from a K out, running a 70 second penultimate lap. If she goes and runs 9:15 face from the gun she would have gotten 5th too. You don't simply run away from anyone unless you are much, much better than the field. There were 5-6 women who could run faster than 9:15, so your strategy would have failed. Yes, Coburn would have benefited from faster race, but not with her leading the entire thing. She made an early move, she didn't wait until 300 to, she faltered on the last water and lost momentum. At the end of the day, with another year of training, she will be a solid gold medal contender in Rio.