Don't worry, you are not discouraging me. This kit is just one of many that I have made, so it is fine if it receives criticism.
For 3, I see your point, and will edit that to make it better.
For 4, I disagree on that. I can see that you made many exceptions to your stated rule, so what is one more? And between an Inquisitor and a Geonosian, if you want to go by power, who do you say is stronger? But my reason for giving the Grand Inquisitor 6 abilities is that he was the leader of the Inquisitorus, former sentinel of the Jedi Order, and was decently powerful in the Force. I could have given him just 5 abilities, but I wanted an ability that reflects how his death caused the Empire to take notice of the Rebellion from more than just a nuisance, to a possible threat. And also in response to your previous response about Fives' sacrifice, he didn't make much of an impact either, yet he has a Unique saving an ally. And I was planning to have the Grand Inquisitor be unlocked at 4 stars, but he could still be a marquee, if he is ever made.