Yes, logical, but in reference to this?
121.495 Pilot in command
(1) A pilot is qualified as pilot in command for a flight of an aeroplane if:
(a) the pilot meets the minimum flying experience requirements specified, in accordance with subregulation (2), in the aeroplane operator's exposition for the aeroplane; and
(b) the pilot has successfully completed command training that complies with regulation 121.565 for the aeroplane operator and an aeroplane; and
(c) the pilot is:
(i) if the aeroplane is an Australian aircraft—authorised to pilot the aeroplane during the flight as pilot in command under Part 61; or
(ii) if the aeroplane is a foreign registered aircraft—authorised to pilot the aeroplane during the flight as pilot in command by the aeroplane's State of registry.
(2) For the purposes of paragraph (1)(a), the aeroplane operator's exposition must include minimum flying experience requirements for all aeroplanes operated by the operator for Part 121 operations.
and why only when OCTA can it be another pilot? 91.640 1(d)2.