Chimbu Chuckles, From what i've been told by a few people who have left Rex one of the major issues is an incredibly toxic culture they have going on there that means that the guys with enough intelligence and motivation to be Captains see the writing on the wall and bug out.
Perhaps you're right on an Industry level, i'm certainly not experienced enough nor enough in the know to say otherwise, but specifically towards Rex, there might be a problem with them and the way they are running things that is behind their lack of suitable applicants and their current predicament?