Just watched again the video of Rupp's win at Pac 10. Looked like a hard but controlled effort. I remember the exhaustion on his and McDougal's face last year at the end of the NCAAs race, and he wasn't anywhere near that. I find it interesting that he was 43 sec. ahead of Derrick and 46 sec. ahead of Heath at Pac 10s. This happens to be almost exactly gap between Chelanga and Heath/Derrick at Pre Nats.
Rupp, however, opened with the pack and built his lead gradually, whereas Chelanga destroyed the field in the first few kilometers. Rupp got his track 10k PR by running with the pack and gradually moving up over the last several laps. It was a study in patience. Seems obvious that he does better with a more even pace if not negative splitting.
I then went and watched Chelanga's race on Flotrack. His kilometer splits were:
1k: 2:30 (!) / 4:01.5 mile pace (good downhill portion)
2k: 5:29 (2:59) / 4:48 pace
3k: 8:18 (2:50) / 4:34 pace
5k: 14:12 (2:57 avg.) / 4:45 pace
6k: 17:04 (2:52) / 4:37 (more downhill)
8k: 22:51 (2:53.5) / 4:39 pace
Chelanga had a 36-38 sec. lead over the chase pack at 5k. By the end of the race he had extended that to 44-46 seconds. 82% of his lead was established by the 5k based on the 5k splits of others. But I bet it was at least 80% within the first 3k.
If Rupp tries to go with with Chelanga from the start, I'm predicting a slow and painful death for him in the second half (Rupp, that is). After all, he hasn't yet broken 4:00 in the mile, and that's essentially the pace Chelanga ran for the first kilo. But if he's willing to let him go and cede him about 10 seconds in the first mile, I think he stands a good chance of reeling him in slowly in the second half of the race.
I'll be there to watch. Hoping to see a classic.