Uh, Marr? What's he got to do with anything?
Heskal got a cheap-shot against Senya. Not sure how you think thats relevant to SCORPIO.
Senya beat Vaylin who went toe to toe with an improved Arcann. SCORPIO also easily dodged Vaylin when she attacked her from behind and was fast enough to draw her weapon and shoot Vaylin immediately afterwards, indicating that shes as fast or faster than Vaylin is.
I was hyping up SCORPIO when Kotfe came out. Its only because we didn't know much about her capabilities before that we didn't rank her highly. The expansions were the first to truly show off her abilities.
The fact that it was revealed that shes amongst the most advanced droids in history should make everyone rate her higher.
Tbh based on what Neph has said, SCORPIO is quite impressive. Good enough to take on Force-users, a few great feats and accolades to support it all. I knew Cipher was very good, but this puts him even higher now.
As for his fight with GG, if he can use all his arsenal effectively and GG has no way to detect his invisibility, Cipher can take this.