Just a guess but PIC time (on turboprops) may indicate someone with more initiative at remote airports where there is little support
The only people properly qualified to assess a pilot's psychological profile including initiative is a psychologist - not a couple of Virgin Blue management aircrew and an personnel officer, HR, or what ever is the buzz word of the day) In any case why should pilot in command time on a turbo-prop be any more an indication of a fine fellow with lots of remote airport initiative time, than a Cessna 402 pilot doing a similar job?