A few more thoughts…
Still trying to determine what equivalent of youkai should turn up in this AU. And there is an equivalent, because Kouryuu ended up dealing with some interesting damage to Gonou/Hakkai. Which argues for some kind of Sith or ancient Je’daii bio-alchemy experiment as part of what happened to him and Kanan. (And previous experiments may have created an entire alien race.) Granted, bio-alchemy creations don’t turn up very often in canon Star Wars, but who’s to say what might have happened on a particular section of the Outer Rim? Or the Unknown Regions.
The bunnies are sure Gojyo’s half-Zeltron… but that’s a near-human race anyway, the other half could possibly be youkai… eh. Still iffy on that. Then again, maybe Zeltrons themselves have a connection to youkai.
On the sutras – if they are Force artifacts for “creating a world”, it’d make sense they are Shadow – invoking both Light and Dark sides of the Force! So far the bunnies have that the sutra can do an energy/explosion barrier, bind things, and possibly destroy Dark spirits just like a Force-imbued blade. SW ‘verse, summoning spirits might not be out of line either… (And now we know how Kouryuu might have led troops through places impossible to scout….)
Helping Hakkai likely involved some level of Force bond. Which means when Goku’s limiter breaks, Hakkai would not only sense the massive explosion of power, but Kouryuu utterly, volcanically, losing his temper.
I see Hakkai as having been back at an aid station not far away; a certain smile crossing his face – and very suddenly and deliberately wiping out every clone in shooting distance.
Gojyo stands completely untouched in the middle of the carnage. Cigarette still in hand. “Okay, I’m going to assume you had a damn good reason for that. Which way do we run?”
Goku’s staff might be the equivalent of a Force-imbued blade, as well.
I don’t want to draw directly on the Je’daii, but… thinking whatever the kami are or were, they have or had a world similar to Tython – without balance in the Force, things get messy. Leaning toward, the youkai are either another species in the same system – like the multiple worlds near Corellia – or they’re possibly a group of related species. Or kami-descendants. And the Sutras were specifically meant to deal with “things getting messy.”
Which may mean the Maten’s been poking at Kouryuu for years. “This whole Temple is out of balance! Can’t we wreck it just a little?”
It’s very likely the sutra’s power may scale depending on how much Force is brought against it. It’s not very powerful against non-Sensitives. (Though Sanzo might be.) Though the bunnies do say it can add to Sanzo tossing a Boom when the landscape just has to be rearranged/flattened.