Not enough. They would be privy to strategy, they would leak it, they would claim insider status and make up BS they’d claim that Trump said. Or they would resign for random reasons strictly to create the impression that the Trump campaign was in full chaos.
We are talking about people who face the prospect of losing $300K - $2 million - $5 million gigs and who have been warned that “they’ll never work in this town again” should they back Trump. Well, if they could take credit for torpedoing Trump, they could. That’s what IMO they would do. They’d strangle their mothers. And their fathers. Hell, they’d strangle their children. These are people who are not just suckups and traitors, they’re proud of being suckups and traitors.
I am for Trump going it alone. It works just fine that way.