Hmm that is fair with dots, and also something I noticed (bards used to get song procs on their dots, now they don't). I think if its called green mage it might delve into shaman/druid/etc as a themeing. Like how blue mage's original practitioners wear tribal clothing and use the equivalent of a counting coup for their weapon.
Yea shell 1 and protect 1 really gives a turtle vibe to me.
We currently do have summoner and red mage that do provide group buffs in terms of damage. I suppose it would depend on how heavy it goes into the support role. As a funny thing is players did reach the buff cap limit in TOP. So that is another thing to consider, is just like how there is a limited number of debuff slots, there is a limited number of buff slots.
Knowing our luck it might be a mix of potential job ideas to make one job. As green mage by itself, even if you gave it all of its green magic, is still missing a lot of ability slots to make it a complete kit.
I figured it was just because Donatello uses two swords, but I guess if there is a possibility they are taking a second whack at chemist, it wouldn't be the weirdest thing in the world.