Hey man, I respect Matt...I really do. Again this thread isn't about Matt (but since you want to go there: I do think his Leadville record is very good...and I also think it is very beatable.His Pikes record is much, much better and less likely to be broken...like ever IMO.2:14 marathoner Max King struggled at Leadville. In reality, 2:30ish marathon guys like Ian Sharman and Anton Krupicka have actually been a lot more consistent at Leadville than most...with Krupicka running within 32-min of Matt's record.I'd actually think someone like Zach would have a good shot at the Leadville record...I also think Zach would probably be about a 2:22-2:25 marathoner if he ever tried one. But flat roads and tracks are not his forte....he is a very good climber and he has very strong "mountain legs"...he is amazing in the hills at long races...So again, in a ultra-mountain race, it isn't about flat-out track/road 10km-marathon speed...sometimes the 2:30 guy beats the 2:14 guy. I think Matt is still a beast. I actually won the Pikes Peak Ascent in 2:10 two years ago, and I was 9-minute off his ascent split that he recorded during his marathon record. That is really impressive what he did on that mountain. Again though, Matt was/is a great mountain-ultra runner not because he had "2:19 marathon speed" or great flat-Running Economy (with a high Vo2max of 90+ that really helps at super high altitude but means at sea level his running economy was relatively poor on flat roads). If anything (with all my comments), I'd just like to demonstrate that Zach is (IMO) for sure clean. What he has done (while very impressive and physically amazing), is something that this sport has demonstrated over and over for years: Hardwork, and specific mountain-training (and running with heart!) can pay off big time in long distance races with lots of climbing...even for those without the NCAA DI college track backgrounds (which certainly help, but are not required to win the big ultras still). Now if some 2:06-2:08 marathoners from East Africa showed up, I might say otherwise...but still... the mountains/hills over 50+ miles can be somewhat of an equalizer.