Interesting to read that Norbury considers himself to be a 'competent' pilot.
If I was the judge I would be calling for Norbury's training records from Flight Safety
I find it hard to imagine a pilot with such limited experience qualified for a C525(S) single pilot type rating from Flight Safety, if indeed he did.
I know by observation that 'Chop' at Aus Jet flew with him regulary as a safety pilot
I know from conversations with Norbury at the time, that he had very poor understanding of the FMS, he never flew often enough to come to grips with FMS based flight especially in approach mode.