- "Current" Ruby vs "previous" Ruby : from the Red Trailer to Penny's death, Ruby was a unique mix with an innocent and childish behavior, a cheerful personality and many badass fighting capabilities. Something special came from her, that's what I called "charisma". I don't know how to describe it differently haha. But since V4, her childish side feels wrong to me. She faced death (Penny then Pyrrha) so I expect her to evolve. I loved the scene between her and Oscar in V5/chap5, it proved how much mature she had become. But still those childish moments all along V4 and V5 ! This feels wrong. Maybe RT did it on purpose, Ruby may be in a long transition period but I think it's time for her to become stronger and more mature in V6 like a better version of the Ruby from V1 to V3 :) She has to remember the last words Roman said to her ("This is the real world ! The real world doesn't care about spirit, the real world is cold !")
- Ruby / death / silver eyes : Like you, I see a strong connection between Ruby's personality and Summer's death. Because it happened when Ruby was very young, I think it magnified and made her personality grow quicker (but she already had it in her because it is simply her nature). But that doesn't mean she knows how to handle death. Ruby didn't see Penny die but she saw Pyrrha die and it unleashed her silver eyes. When Jaune was on the verge of dying against Cinder in V5/chap11, again the silver eyes coming off. I really think the power of silver eyes has something to do with death itself or at least the fear of death. Ruby still doesn't know how to handle death (we never truly can but everyone can become stronger about it) and I think it explained why she still can't control her power. I hope this will be answered in V6 (with Ozpin teaching Ruby and flashbacks about Summer Rose).
- God of Light / God of Darkness : I don't think RWBY is just another "good vs evil" show. We still don't know all the motivations of every vilain but so far it is not just all about "having power and destroying everything". Cinder unfortunetaly seems to be like it but I believe the story will be much more realistic with Salem (and I'm also looking forward about how Emerald will evolve).
Almost all characters are made of several shades of grey, not just white or black (Raven is a good example, Ozpin also seems to). And this perfectly illustrates the common creation of the two Gods (mankind). So far, I find the show very coherent on this subject.
About the Gods themselves, why should we believe that Qrow tells the truth ? He told the story based on what Ozpin told him ("But if you believe Ozpin, etc...). Personally, I would ask for more evidences concerning the origins of mankind, dust, aura, the relics and the Grimms but I would'nt mind if it is not the case (the World of Remnant series is enough I guess). But if the two Gods really exist, then yes, where the hell are they and what are they doing ? What is the real story between them, Salem and Ozpin ? Will we hear from them if Salem is defeated ?