Perhaps this piece of armor should be looked at by the dev team to make sure having newer jobs as subjobs also works with it. I was thinking in particular blue mage, seeing as their traits are apparently never transfered to the wyvern.

I don't really think it would be broken to give the wyvern all, or almost all subjob traits. Not too many of them d irectly boosts the wyvern's damage anyway, except zanshin, double attack, and attack bonus traits. Perhaps Store TP makes a slight difference after a while too, idk.