Just to be clear, CTC does not block modular guys (& gals) in fact recently EZY and others have cleared out the AQC CTC hold pool and they are all going through their line training etc. most are modular with varied experience as FI's, meat bombers, tug pilots and the like in all age ranges and second careers etc.
CTC do not BLOCK modular/ self improver but are the only conduit to certain airlines.
I will say again that the full time crews have let this situation occur and continue to allow it to get worse.
For example objections around Merlin almost entirely are related to the seniors whinging that they are not getting RPI related increases, not anything about random rosters for the newbies or the over reliance on Flexi crew.