To your point,
I'd say most posts that believed he'd beat Rupp were crazy trolls, that was delusional from the start. He was on 2:13ish pace until the last mile and half..as his last mile he fell off. Rupp ran a 2:11:12 on a flat course 4 years ago at the trials and year and half later hit a 2:06. He now just ran a 2:09 on a wildly different course in heavy wind. You seriously can't judge a runner off their DEBUT race, I mean come on, I'd say that about any other runner not named Walmsley.
Bernard Lagat ran half a minute faster than Walmsley, I know he's older, yet he is one of the most decorated 1500, 5k specialists ever. Walmsley also placed higher than Jared Ward, and that's not a hit on Ward, I am a big Ward fan, just the facts that day. Ward ran a 2:09 and a 2:10 just in the last year.
I am sure more trail/ultra fans would love to see OTQ runners hit the trails and get served some humble pie. Would there be faster times, yes I am sure of that. Would it be the pure dominance these forums believe, no. Not to pile onto Sage, but he went into Western States talking about course record and was on a hot streak 4 years back leading into Western, a far bigger name than Walmsley, as was Max King in 2014. Both Sage and Max were beat by runners with far slower road marathon times and both hit a real bad patch in the race. Again, the correlation is strong in some races, but unpredictable past the 50 mile distance as we're seeing thus far, especially depending on the terrain and conditions. Mike Wardian in his prime was a 2:17 marathoner, and he didn't even place top 10 @ Western States back in 2009. Hal Koerner a low 2:30s marathoner, beat him by 3 hours (and won the race.)
Some of the claims here are just bitterness about Walmsley, end rant.