A bit of insight into why Yiannis was so successful might come from the first big intercity race between Sydney and Melb. back in 83. A race he didn't run.
There was rivalry here bw George Perdon and Tony Rafferty. The 2 of them would run FKTs between Aussie cities.
A race was organised with $ on the line. Lots of the big name ultra runners were going to be there. You had to qualify through a 24 hr race. One of the qualifiers was Cliff Young a 61 year old farmer from near Colac. Cliff was known in running circles mainly because he had run just over 3 hours in the marathon in long trousers and a dress shirt.
All the guns had strategic plans of running and resting. Cliff on the other hand just ran it as a race. He had a shuffling energy efficient gait probably developed from herding sheep for hour after hour as a young bloke.
When the big names stopped for their planned rests old Cliffy just shuffled on, and on, and on, and on.
He stopped only when he could go no further and only briefly. Then off he shuffled again. He just ran away from them all. Not through ability but just through stubborn determination to keep on moving. He was tough as teak. He talked of times on the family farm where he would spend all day herding the sheep to safety in wild weather. So plodding along the Hume Highway day after day was no big deal in his mind. He used no science, Cliffy was a very simple guy, not perhaps the sharpest tool in the shed.
So along comes this young Greek guy with fairly high end running talent but with that same mental and physical toughness as Cliffy. Better organised, smarter in preperation.
How many very talented guys would even think about the possibility of running 5 or 6 days almost continuously.
I was running a 24 hour relay at Coburg's Harold Stevens track years ago. Yiannis was determined to break the 300 km barrier that day/night. In the middle of the night it absolutely piffed down. We were all sooking about racing this relay on the flooded track in the pouring rain. Yiannis just kept ploughing on relentlessly. He just missed the 300 kms.
Watching him that night was something else.