There is an obvious difference. A contract with a billionaire owner may be just a tad different than any other company agreement.
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It depends on what kind of aircraft commander you are. Are you a Co-Captain? Then you may be the deficient one. Be careful with that.
There is is no grey area here. There is one person in command of that aircraft. The Captain. Don’t ever forget that.
That's the dumbest response I've seen yet. I don't think your widow (or your owners family) gives a rats ass about seats. If bad CRM due to either a deficient pilot (in any seat) or a PIC who thinks he's immune to falling victim to another's deficiency results in an accident, well dead is dead.
You're acting like a fool when you double down on arrogance.
There is a reason these aircraft are typed for 2 pilots.