I still don't get the point you're trying to make (monkey in space and manick guy named Jack):
We all agree US gravel races are fun, we all agree guys like WvA and MvdP would smash any race.
So we agree. Just tell us from the beginning what you accept (or better: don't accept) as reality (that pro tour riders would take over any random US gravel race, if they wanted), and what you want reality to be (heroic wins by Keegan Swenson in mud 3-feet deep after a 300 mile race because those euro pro boys weren't man enough).
Reality and phantasy of what reality should be are different things in your minds, that's very obvious. But as said, most people cheer for the underdog, the lone breakaway rider, they value the smaller races for the connoisseurs, the cat. 1.2 races in France that are won by French who make surprisingly good money on teams with stupid French sponsors that pay way too much for overvalued riders... Just like that Keegan Swenson guy that gets paid well because he is in the center of the gravel hype. Just like Belgian top 10 CX riders who make more money than 90% of proCT riders and gravel riders. Japanese Keirin riders who live in separate houses / schools with other keirin riders in a strict regime of training.
All those niches are valued, and we all love a good race between homeboys / traditional heroes of the sport and the so-called superstars, where the homeboys win because they have particular experience in the sport.
But don't you ever think that, in a sport as brutally honest as cycling, the odds favour any of those hidden niche riders, be it in Japanese Keirin, Belgian CX or US gravel. The local heroes are just that: local, and dreams of keirin fans were smashed the moment Theo Bos competed, Belgian CX is dominated by a tridente but mainly MvdP and US gravel will soon be conquered by any good pro who has a good incentive (money or too much time on hands) to ride one of those for real.
The odd exception may still happen, but the general consensus is that riders make the race, and while absentees are always wrong and winners are always right, there is simply no way to debate chances of current top 10 US gravel riders vs. pro tour pros without resorting to vague arguments and ignoring the numbers.