I'm dealing with two first-class information hoarders right now, and I'm about ready to quit, as there is no way around them and no one who can help deal with t

I'm dealing with two first-class information hoarders right now, and I'm about ready to quit, as there is no way around them and no one who can help deal with the problem. Both of them are long term employees who are trying to move up the chain but don't have the skills or the experience to do so, so they are stuck in middle management roles, each with two entry level direct reports, and they make life difficult for everyone else as they attempt to exert themselves across the business. They keep all information close to the chest right up until the very last moment. Then they'll drop it on the team before a meeting (because sharing documents earlier creates confusion, apparently) and then they'll dominate the whole meeting, never letting anyone get a word in. It's always someone else's fault for not knowing something, or not being prepared ahead a feature release or client implementation or project launch. It's always someone else's poor performance or lack of effort, which is why they have to compensate so much, why is why the have to do everything to make sure it's done "properly" according to their standards, which is why they are always so, so busy. The only people who can address your obvious incompetence are these two people, because you can't do it right, so they have to do it, and they'll tell you what they are doing when they are ready. And they'll make sure to tell the C-level team just how awesome they are, while making sure to trash talk everyone else around them. These are the worst people I have ever worked with. They possess no conscientiousness whatsoever. My only recourse has been to directly roast them in public Slack channels with clear questioning that exposes their lack of thoughtfulness. I try to squash their incoherent babble with clear writing and common sense communication. This silences them briefly, but in those moments the rest of us can get a word in, can contribute to the work, can steer the discussion, and we start to make small steps forward. Until they decide you're wrong, and the routine repeats.