I think a pro can play about any genre challenged with to some degree-Dennis Chambers first hear and then play.
He can play it but it didn't sit well or feel right. Denis said upfront that the music was not "him", and you can hear it. It's not about complexity because, if he was given a complex fusion tune like Captain Fingers, he would have killed it.
It's about slipping into the innards of the music like Luke Skywalker keeping warm in the dead Tauntaun
Drummers need to listen to a style a fair bit before playing it to internalise the feel. A good player can make a decent fist of almost anything but that's not the same as nailing it. You gotta feel the lurve.
When I was young my sister was in a LTR with a top jazz sax player. I used to see his band all the time and picked the brains of his drummers. One time, he had to hire a rock session drummer for a bop gig, and the guy was a tad intimidated. I actually liked what he played more than many of the specialist jazz drummers, but that was probably my rock ears. What he played sounded clear and crisp, and it all swung nicely, but I did notice that he was much more timbrally limited that the jazzers and sometimes didn't burn as hard. He sounded more like Bill Bruford than Brian Blade, you might say. I'd be overjoyed to sound even remotely like either.
Another thing. When versatile players spend a lot of time in a genre, it can take them some re-adjustment to switch too, even if they're returning to their first genre. You're not going to be playing rimshots on a loose-tuned 14" mounted tom with pinstripe heads that is designed to go
boom. Nor will you be smacking down a fierce backbeat at bop gigs. There's different ways of moving your limbs and your brain in rock and jazz (esp bop).
A side note - Brian Blade playing with Black Dub. That was super interesting. He played pop and rock like a jazz player and it worked brilliantly. Meanwhile, Bruford left the prog fusion of UK and started the first iteration of his jazz band, Earthworks, using his crazy 80s syndrums and popping backbeat. It also worked brilliantly. I enjoy that kind of crossover even more than traditional, authentic music. It sounds fresh to my ear.
So there's a huge "it depends" around the jazz and rock questions. Maybe, in time, these questions will be replaced by the relative difficulty of rock drumming and programming?
Geez I talk a lot - just another rambling old fart haha ... "back in my day ..."