Additional reason to switch jobs: It is perfectly working for now, as far as the company is concerned, the three man team is doing a tremendous job, and the team conviced itself of the same. Now they have to ship additional stuff, and think they are perfectly able to do so. You are there to make sure they ship, most likely they wont, because things work until they don't anymore. When they don't, and the team isn't shipping, guess who gets the blame? The one team member, the one thing that changed. And after that, the mess will only grow.

Edit: Typos. I suffer severe typing legasteny more often than not...