I'm thinking the broski ahsoka is going to sacrifice herself to get Ezra and Sabine back
. She already did it once in Rebels.
If Disney have balls, that's the move to make. As moving forward, it doesn't make sense Luke being ahead of her because she has the stripes, better mindset and experience. Luke's bytch made in comparison, sorry to say.
Then make the show that ties the arc up called Thrawn. Thrawn as the main character would be
. They could even do a season/few episodes dedicated to how he came up from a young kid.
It'll probably be Luke who finishes him but the story's a little stunted because palps can't come back yet.
P.s. there's a chance jk Rowling might have ripped off the horcruxes from how they explained palp's use of his clones in the EU