Incorrect WTON, I understand the captain on the norwegian flights is still in command, regardless of being in the crew rest or not. He is not off his duty and is the PIC the whole time, unlike airlines to the likes of Emirates. He just deligates the controls of the aircraft. So no logging of PIC time for the RCA! Would also be fraud if the RCA would log it as such as more people log PIC at the same time otherwise.
And the RCA position with Norwegian is more like that of a senior First Officer who can sit in the left seat. Just the name of the position includes the word captain. The actual role is not!