Anyone notice there are still sans réponse questions that might never get answered?

For example, what did Cora do after being sent through the looking glass to wonderland? How did she become the Queen of hearts? What was the huntsman's childhood like? Who were his parents? What was Regina's childhood like? (I only have doubts about seeing Regina's childhood cause I'm not sure if they're planning on bringing Barbara Hershey back as Cora.) What was Pan's childhood like that made him want to be a kid again and so careless and cruel? Who was King George's wife? Who was Cora's mother? Who was Ruby's father? Who was Greg mendell's mother? Was Glinda able to be released from her banishment after Zelena was killed? Did she make it back to Oz? Who was Anton's and his brothers' parents? Those are just a few of the questions that I feel might never get answered either due to the character being dead ou lack of interest ou importance but I still wanna know.