I know this may be surprising to hear, but as someone who has studied athletic performance and happens also to BE an amateur athlete, I can tell you that your hypothetical scenario doesn’t necessarily give enough information to determine who of those three would perform better.
But since I don’t think you would be interested in seeing the journal citations or learning about things like ATP, VO2 etc etc I’m not going to bother any further.
My hypothetical scenario gave plenty of information for any betting man. My money would be on the guy who ate carbs over the guy who ate nothing or the guy who ate sugar - and I would have a sound biochemical rationale for why.
That sound biochemical rationale was behind my illustrative point about ‘carbo loading’ vs ‘sugar loading’. Sorry you gained so little by my pointing out this fundamental difference.