They don't call him Kouros for nothing. When showing up to a new race venue, Kouros would walk the course from every imaginable direction with his handlers / support crew checking the tangents with a string. He was inclined to not even make use of the porta-john available on the course. This was in 2013 when Kouros was, at 57, well past his prime with nothing left to prove, and he was about to face 6 day debutante Joe Fejes, 9 years his junior. Supposedly Kouros left the course for a whopping total of 4 hours over those 6 days. He was known to be a friendly person outside of races, and to be a fierce competitor during races. Essentially once Fejes pulled ahead by about 5 miles on Day 6, he sat on Kouros, running the same pace until he won. Kouros thought the tactic ungentlemanly, and Fejes in the time has told me he agrees with the sentiment.
Often times things get lost in translation even when speaking the same language. In this instance, a second hand report came from Kouros' handler, in Greek, immediately after the race, where Kouros was on the course for 140 out 144 hours (let that sink in) pushing himself. Of course emotions were raw. I think it fair to say not everything said at that moment was fair to either athlete to print as a news item. John Geesler, former US 24 hour team member and former US 48 hour record holder, who had raced against (ok, that might overstate what he was doing in the same race) Kouros many times before told me he had never seen anyone, including Kouros, push him/ herself so hard for so long before in any race - and this, again, in a race where he has nothing to prove. He walked away with a newfound respect for YK.
Again, they didn't call him Kouros for nothing. There were plenty of races he did that were not Rupp Certified (a broadside that seems perhaps a bit more justified) that are not necessarily on race databases including I believe a mountain stage race in Tanzania, showing up to Western States a mere week or two after nearly breaking 10 days for 1,000 miles (a race that he pretty much winged), or his outstanding Sydney to Melbourne races. Heck, he never complained about the lousy course conditions when he ran World Records for 100 miles (as a split no less) on the roads, and 24 hours (any surface, with 178 miles) during Hurricane Gloria in 1985. However, you don't put up performances like he did without extreme attention to detail. Kouros had also run Across The Years eight years prior in 2005 when it was only a 72 hour event. It was I believe a different venue. Every venue has it's drawbacks to be sure, and the new one caught him by surprise. Yes he was particular, but it's silly to judge a person and his race career off of a single race that can be explained away. The Kouros you describe would have cried foul at getting accused of cheating in his debut ultra (Spartathlon). He merely showed up to short loop verifiable events with heavy scrutiny, and put up similar events. Yes, he was (is), or at least comes across at times like a prima donna, but we share mutual friends who have gone on about his kindness, humility, and generosity. In short, he's human, and in achieving greatness in some regards, other things suffered along the way.
Getting to Proctor - by every measure, anyone who knows him seems to say how nice a fellow talented a runner he is with good multiday potential. He certainly ruffles feathers (mine among them) when making broad announcements like he is going to break Al Howie's TransCanada record (FKT) rather than express the same goal with a bit more humility and grace, and I wish that he'd put the efforts on the roads or track instead of what he does on the treadmill, but at no point, from anyone or any place, has there been a concern of him cheating to the best of my knowledge. To even suggest that without some serious concern is entirely off base.