What I was saying is that, unless a person can cite to a specific section and subsection in part 91 that requires an unrated pilot in addition to the PIC when operating under IFR, the rule about both pilots logging the time does not apply. Nobody can cite to such a section because there isn't one. Thus these two hypothetical pilots can't both log the time. I'm sure someone will come along and try to explain it in yet another way in the hope of being clear enough to prove you wrong about the futility of the matter. That's how I got involved. Oops.