Uplinker
"This incident did not involve an aircraft in flight - so there was no immediacy required and the nose gear pin was checked by more than one engineer on three separate occasions, if I've read the report correctly !?"
The report is a tad ambiguous on that point.
The engineer confirmed several times to the flight deck that the pins had been fitted. Given that he had fitted the MLG pins himself, watched his colleague fitting the nose pin, and could see all 5 streamers dangling, it's by no means certain that each confirmation was preceded by an additional check.