Cobham will cut you early if they have the slightest concern about your performance.
Simple as that.
A buddy of mine with an extensive training background is a captain at Cobham. He has serious concerns about the standard of some of the F/Os at Cobhams. He tells tails of having to take over from F/Os doing visual approaches because they lack basic flying skills. Not saying everyone there is substandard, but the statement that the standards are high does not ring true from what I have heard.