Can both DF users Jack and Brook survive under water?

We all know that Jack the Drought us able to survive underwater as a DF user. Usually, having a DF renders one useless and the results in them typically drowning. It’s pretty obvious from the teeth we saw, that Jack is part fish-man, which allows him to survive underwater, although he cannot move due to eating a devil fruit. So my question is, would the same thing happen to Brook?? If tossed into the ocean, he would be inevitably sink to the bottom, and while not being a fish-man he has already “died” before…lol and breathing really isn’t an issue for brook, well, since he doesn’t need lungs yohohoho!!!