If there are 3-4 pilots then there is PIC, SIC, TIC, and FIC. If the PIC is back sleeping, then there is an "acting PIC". They are not "PIC", just acting while the CA is sleeping. I didn't log my time as PIC or TIC or FIC. All my time was SIC, even when I was not second in command. I'm not making a new column. When I sat for hours in the left seat, I was SIC. I would have never logged any PIC time for a plane I didn't sign for.
I see no gray area. I would not hire anyone who tries to pass their time as an FO in any aircraft as PIC.