Given the levels of recruitment over the next 12-24 months would it be fair to conclude new joiners will move up the 320 seniority list at rates faster then previously seen in BA?
Who knows?..That depends on the whole host of unknowns that determine whether recruiting continues...as I'm sure you realise.
In general recruiting at BA has always been stop and start since they started (?restarted) DEP recruitment in the late 80's. In any event the nearer the front end of a recruitment bulge you are the better, so I suspect the likes of CAT3C is probably well placed, whereas someone joining in a year or two might end up stuck at the bottom of a list if for unknown reasons recruitment dries up again.