All I can do is laugh.
This "logging-of-PIC-flight-time" question comes up all the time. Continuously. Perpetually. I don't expect it'll ever go away. Well, let me show you with something you have obviously never read; it's an excerpt from the Code of Federal Regulations, Title 14, Part 61, Section 51, Paragraph (e):
"Logging pilot-in-command flight time.(1) A sport, recreational, private, or commercial pilot may log pilot-in-command time only for that flight time during which that person—
(i) Is the sole manipulator of the controls of an aircraft for which the pilot is rated or has privileges;
(ii) Is the sole occupant of the aircraft; or
(iii) Except for a recreational pilot, is acting as pilot in command of an aircraft on which more than one pilot is required under the type certification of the aircraft or the regulations under which the flight is conducted.
(2) An airline transport pilot may log as pilot-in-command time all of the flight time while acting as pilot-in-command of an operation requiring an airline transport pilot certificate.
(3) An authorized instructor may log as pilot-in-command time all flight time while acting as an authorized instructor.
(4) A student pilot may log pilot-in-command time only when the student pilot—
(i) Is the sole occupant of the aircraft or is performing the duties of pilot of command of an airship requiring more than one pilot flight crewmember;
(ii) Has a current solo flight endorsement as required under §61.87 of this part; and
(iii) Is undergoing training for a pilot certificate or rating."
This information, along with much other information, is contained in several sections of the Code of Federal Regulations. Folks who obtain Pilot Certificates in the U.S. are required to be familiar with these sections. Also, Pilots operating in the U.S. are supposed to abide by these Federal Regulations, although in practice, very few do. Most just do what they think is logical, or what someone else told them to do, or whatever they feel will best serve their interests; and this is especially the case when it comes to the subject of logging PIC time.
Have a nice career, and fly safely. All the best....