My IGD is soon 7* and I started him only after SF and Maul were ready. I am not too sure what level I had but as I just turned 80 now, I think it was about 75.
I don't suggest Dengar. My Chewie should stay 5* until Raid Han Solo is ready.
Actually I needed to google what EE means..
No Ewok Elder for me.
Btw Rancor raid: my guild has a restriction for only one team, and my arena team is okay there (400k p2). Some day omega QGJ and Rex will also be ready, so no problems here. Rather focus on AAT teams.
If your guild struggles with hRancor, consider to change it.