I have no idea. I haven't flown with all of them. Certainly the pilots that are afraid of using the F-bomb because they have to fill out a report would be grouped into that definition. I have flown with several pilots that I considered to be weak PICs, but according to Raj, "everyone" is afraid of fatiguing. I'd give the pilots a little more credit than that.
I'd love to see the stats associated with this F bomb report.
F Bombs prior to the IBB
F Bombs post the IBB