bushy
You don’t need an ATPL to have a P1 rating on a multi crew aircraft above 5700 kg. To log PIC though you do require an ATPL but to log ICUS or P1US you only require a CPL.
Islander Jock
Almost all correct except the FOI was wrong in stating that you have to have a C&T next to you. Certainly in the majors and in most regionals, CAR 5.40 is followed to the “T” and states that only a line captain is required to supervise an FO logging ICUS. Maybe your friend needs to point that out to this FOI who quite clearly doesn't understand or know his own regs to have a re-read of CAR 5.40.