I've posted this story here before, but it's relevant so here it comes again. We have jams at our house periodically. Big parties, really, and we invite anyone who wants to play to play music in our studio.
One of our friends is well known around town as one of the best jazz drummers in the area. He plays routinely with our best and most elite local jazz players. Super nice guy. He showed up at my birthday party and gamely stepped in when the other drummers were ready to get on with socializing. He really tried hard, but clearly rock is just not his thing. I don't have very many other friends who are really hot for jazz, so we all soldiered on. Just because someone is stellar in one genre, there's no reason to expect they'll be very good outside of that.
The thing I learned from that experience is that the role of these instruments (both drums and bass) is very different in jazz than in rock. Someone here once suggested that the key to playing any genre is to learn jazz first. Nothing could be more wrong.