At a Christmas do hosted by Jo Bonnier in his palatial surroundings, some time in the mid sixties, everyone was encouraged to have a go at bouncing up the ceremonial stairs on a pogo stick. Almost everyone fell off after the first couple of bounces.
The exception was Jim Clark, whose first attempt saw him flawlessly bounce up each step in turn to the top.
The phenomenal sense of balance Marquez has would definitely be an asset even in today's F1.
Oddly, his size might be a problem; he might be too small. I think of drivers like Roberto Moreno, who were brilliant in the lower formulae, but when they got to F1 and faced the exponentially greater stresses and longer Grand Prix races, could not cope.
That is a very interesting story, also regarding the fact that Surtees (the ex-motorbike-champ) crossed over to F1 and won the worldtitle during the 1,5 litre era (and also drove and won a GP in the 3-litre era, btw). I've always had the idea that Clark was even more unbeatable in the 1,5 litre F1 cars than he was in the 3 litre era. At least Graham Hill was a lot closer in the 3-litre Lotuses than he was in the lighter versions.
I've once read a comment by an ex-F1 driver that Clark was so good in the light F1 cars, because he was so good in taking a lot of speed through the corner and he could do that by the incredible feel in his hands and, sorry, the seat of his pants. That advantage was slightly negated by the 3-litre cars where you could use the throttle more to build speed after the corner.
Exactly the opposite (of Clark) has been said about Niki Lauda, by one of the engineers of Porsche, I believe, when he was dominant for Ferrari (1975-1976). He said words to the effect of: 'If F1-cars had 300 hp, Lauda would not be so dominant. If the F1-cars had 1000 hp, he would destroy everyone.'