Interesting.
My Mezzo with kojacks is definitely a lot faster than the marathon shod in the same set up. (now sold)
Don't have any data to prove the case.
I don't have a jokack tyre on my birdies to do a rolling resistance test.
I tend to buy what I know. And don't have experience with the "racer "model or "duno "
Marathons can be a quickish tyre if pumped up very firm.