Even in super shoes Ben is a 2:10 at best, but more likely 2:13.
Note even sure about that. Over 2:15. No knock on Ben. He had a great career on track but it's a tough transition for 1500 to marathon.
I know a bunch of guys who run in the 2:17-2:20 range. All total amateurs, never got anywhere near the pro level, and most in their thirties. So I don't think it's a stretch to believe an elite 1500 runner can run faster than 2:15 with proper training. A guy finishing 8th at the Olympics must have a lot more upside in the marathon than the amateurs with full-time jobs that I know