In FFV, the Bare did take on a number of other-class traits as abilities were gained, although this was not universal among the job classes. It's the reason many people switch back to a Bare in the later stages of the game. In FFX-2, there are no supplementary bonuses granted to the jobs because one or more was completed. As a matter of fact, the job/level statistical correlation in FFX-2 is static. If two characters share the same job and same level (and neither is enhanced by accesories, etc.), their statistics will be completely identical.