Known quantity? The only guys who got sent back thru the training system at my carrier were exmil. All of civ pukes made it through without issue. I guess the Airbus is a tough plane to learn for them or something.

When you talk to regional folks in the training dept by far their highest pass rate is with young ex-CFIs out of the entire demographic.

The worst absuer we had was an ex mil guy who went out on disability and collected from the company but then flew fighters as an IP for his guard unit. After that some big restrictions were put in place on taking disability. Just like anything it only takes a few to ruin it.