Well, I've always thought that when you fly with someone else two heads are better than one. Whenever I've done so, if we haven't been sure what to do, especially in the case of something like deteriorating weather, we've made a joint decision. If someone with me wanted to turn back then I would, even if I felt it wasn't necessary, as I could be wrong. It's always been the same the other way round too. When I did the Dawn to Dusk earlier this year, both of us specifically agreed before we started that if either one of us wasn't happy with something, then we wouldn't do it. IMHO if you reach the point where someone NEEDS to pull rank and insist they're PIC, then things are going very wrong.
------------------
To fly is human, to hover, divine.