They are not necessary the least capable, just those who can access funding for the licence & a rating. So what you get is a mixed bag. Some are very good, and some less so. A large spread of ability. Think random number theory.
That is why sponsorship by the big players historically got the most suitable. Not constrained by financial clout. Something which Aer Lingus are attempting to aspire too. And of course the military would not consider anything but quality.
Unfortunately the beancounters rule the roost, and concentrate purely on the bottom line and the cheapest training costs possible.