Maybe you could convince your hubby that being "alpha" (ie leader) is like being a good commanding officer. Dogs like rules and consistency. Dogs hate being confused, led around in circles, and "lied" to. They like people who are fair and follow through. Dogs, especially the smart ones, have an innate understanding of basic justice, fairness, and trustworthiness. Be those things, and your dog will follow you off a cliff if you ask.
He also needs to understand that dogs don't want to be the leader. They are looking FOR a leader. They're happier when they're the follower. He just needs to make it clear that the dog doesn't need to worry about that.
There's no need to out alpha the dog in the bedroom instance. A simple, "It's me" would have probably fixed the situation. If that wasn't enough, then a no-nonsense command to get out of his spot would also work (provided your dog knows something like "off"). No emotion at all. Just a command and the expectation that it will be followed. Dogs pick up on that.