I hope you can see the irony of that statement Rep, factual as it maybe. With few exceptions, the travelling public does not distinguish between JC (or any subsidiary) and QF mainline. Same uniforms, same livery, same product.
If something unfortunate were to happen, a courtroom might absolve QF of some liability but the Public would not.
As such, I highly doubt the QF brand would be happy with sub-standard Pilots operating under their banner and thus the reason for their failures to move into Mainline lie elsewhere.
Honest question, was the failure rate from JC Pilots any higher than other entities in the Group? Are they not simply paying lip service to give the illusion of internal career opportunities while hiring externally?