Most of the guys I fly on the airline with, have paid 100k euros for integrated training, spent 30k on a type rating, been treated like crap by Ryanair for three years then come to us.
very little have instructing experience . Although personally I believe any flying / other career before airlines makes the person more grateful and interested in the airline stuff.
Id done 1600hrs instructing when I got my break onto a small jet, but it was only a few airlines that actively courted instructors like AirUk and jersey European