So this was a co pilot landing, in that weather?
If yes, then the PIC bears responsibility too for sure.
Was the PIC a man? Probably too concerned with being accused of sexism to take control.
The PIC was primarily a simulator pilot. His total hours over decades was something like 3,000,
Those conditions aren't consider "weather" for Toronto.
She was the PIC, the "sole manipulator of the controls", because she needed to build her hours for the airline.
The senior pilot would log his time as Second-In-Command (SIC) because he didn't need the hours. He would bear would bear no responsibility.
Code of Federal Regulations (CFR) ยง 91.3 Responsibility and authority of the pilot in command.
(a) The pilot in command of an aircraft is directly responsible for, and is the final authority as to, the operation of that aircraft.
Yes, on a provisional ticket.