You have to fire them. Hire replacements first, then fire them. No matter what you do they will think they are smarter than you because they built a successful

You have to fire them. Hire replacements first, then fire them. No matter what you do they will think they are smarter than you because they built a successful product. They haven't seen anything other way of doing anything. If you don't get rid of these idiots you will never be able to fix anything, they are going to go around you to management and blame every single issue that comes uo on you and your changes, and eventually you are the one that is getting fired.