Krav Maga isn't meant to be a 1 on 1 straight up challenge fight scenario. Its purpose is to cut reaction time down in fight or flight scenarios so that you overwhelm your would be attacker with violence before he even begins to realize you are fighting back.
It isn't mean to be a heads up confrontational fight against another skilled fighter. That just isn't its purpose.
JKD really is another misnomer, with only a few people out there truly qualified to teach it as a style, most use a JKD Concepts methodology, that basically is a blending of arts where you sort of takes what works for you. The advantage tends to be a lot of sparring, and a full range of fighting. Jeet Kune Do is a philosophy more than a style in most cases.
So if you were to take Dan Inosanto's top student with no other background that what he has learned from Inosanto, and place him against Darren Levine, Eyal Yanilov or Amir Peretz top student again with nothing other than what they learned from the instructor, I would say more often than not that the Dan Inosanto student is going to come out on top. This of course doesn't take into account the pure chaos factor of a fight. A missed block, a slip of balance, an over commitment, little things can easily change the outcome. Skilled fighters get beaten by those with lesser skill all the time. Highly trained operators get killed by untrained civilians. There is a large chaos/luck factor that gets thrown in there. But on theory, a JKDC person trains multiple ranges, usually including weapons with Kali/Escrima/Arnis, and spars and pressure tests his skillset continuously. He refines punching, kicking, grappling techniques and adapts them.
A Kravist in general practice isn't honing how to punch better, but how to react to a situation faster. The purpose is to cut out hesitation and improve reaction time.
Conversely, if you were to take Dan Inosanto's top student and place him in a violent ambush scenario, he wouldn't fare as well as the Krav Maga gurus top students, simply because that is what they train for.
The best Kravist are actually people who have a full on Martial Arts background, for example Bas Rutten, a great kickboxer and MMA fighter is an avid practitioner/fan of Krav Maga. Clearly he is going to be better prepared in general already having the technique he has, and applying Krav Maga methodologies .
Similarly most JKDC folks are guys who already have a strong base in an art, which they draw off of to make their own Jeet Kune Do. Which is essentially the principle of Jeet Kune Do, that each person's Jeet Kune Do is going to be different, because it focuses on what techniques and principles work best for YOU.
IKMF G-4 Kravist, lots of JKDC training with Straight Blast Gym