Every year something new wrote:
Last year it was because she was too aggressive and led for too much of the race.
Then it was because Jeptoo was on drugs
NO MENTION OF SIZE FOR THE COURSE.
This year she needed something new so we are now told that she doesn't have the right body type for success on the course. Even though Rotich has a similar body to Shalane and she won.
The truth is that Shalane thought she needed more closing speed this year and they trained accordingly. She was ill prepared for the course. Closing speed is only important if you are in position to use it.