Not sure if you are correcting me, or sarcasticly agreeing with me. He is a staple, regardless, in the early nodes, to block your healing. Daka, Dooku, and RG for the late nodes to wear you down. Its probably designed that way.
Could he navigate the Sun Crusher asteroid belt without a map in a fighter equipped with a superweapon? Also, are we even sure Han was even piloting the Falcon? He never seems quite as focused in the Falcon as Chewie does, and we do not speak Wookiee. For all we know, Chewie could be growling "Quit telling people I am your…
Mace's random expose needs to be unavoidable is all, I think. The fact that it can be resisted is what makes it suck. And Plo just needs a Potency buff. These seem like easy fixes, and therefore will never happen.
There is no evidence to support an Arena to GW difficulty correlation. Use your A team in Arena. I use Lumi with Barriss lead in GW, and complete every day, same 5 Jedi, unless I need a Suicide squad hit.