Well, they do have to be interchangeable for all content, right? There have to be a lot of similarities in what they can do.
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MCH Flamethrower.
Time to set the world on fire!
Ninja frog summon intrigues me because it appears to be a jutsu that is cast at the end of a combo. From what we saw the Frog used a form of katon, so it's possible we may learn other animals/have access to other animals that are used in other combo finishers, that's my hope at least.
Someone in another thread suggested the BLM spell we saw was, 'Burst,' the lightning aspected Ancient Magic we've been missing (Flare for Fire, Freeze for Ice).
What you're calling Simian Thrash is just Tornado Kick.
It seems like Monk has an ability that lets us go from no stacks of Greased Lightning to 3 Stacks, which is kind of...so so. We technically already have that in the form of Perfect Balance so I'm gonna hope that it's something else and they just reduce the timer on Perfect Balance.