If Thrawn is included, the name may be all they keep and his personality may be changed beyond all recognition. Essentially, he may just be a vessel to get the Chiss species back into current canon. For example, if they made him incompetent, slow-witted, uncultured etc.- basically stripped back everything that makes Thrawn ‘Thrawn’. If this is the case, would you consider this a bit of a hollow victory, or just be happy that Chiss are back into canon?

Just answered part of your questions here (x)

As far as cutting back his “persona”: Part of our PITCH says not to do that to him. Watering down THIS character for the Star Wars Rebels would make for bad storytelling and we think the creators KNOW this fact. 

The Disney executives do not. They think that Star Wars ended in 1983 after “Return of the Jedi” and the attempt to water down THRAWN would be made by them, UNLESS they were given a viable, feasible, and profitable reasons not to do it. What are they?

Off the top my head here is what we think the reasons and I need more and you can disagree with me on the merits.

1) The Chiss are now the equivalent of the “Star Wars Vulcans” from Star Trek. We have an opportunity to honor Mr. Leonard Nimoy in Star Wars, which is not unheard of. We can have characters that use logic to defeat their opponents rather than just blasters and lightsabers. And we know THRAWN is a bit more “violent” than the Aristocra allows and sometimes “irrational” since he’s a villain.  Besides, it’s STAR WARS we can add stuff to the Chiss that’s special. Why be tied down ONLY by the books? 

2) Kids, children, younglings, young people need to know more about fine arts, art, anything appreciating art, period. That’s marketable. That will make it happen. IDGAF if it is “paint by numbers”, all kids should learn about art… Because…when you understand the art… 😉

Please feel free to add more…