So one of the big questions still out there is the one concerning Sophie and Josh's ancestors. We don't know yet if they are/were Elders, the original twins etc.
As for Gods being more powerful than Elders, there are many examples saying that a "God" is
an Elder. In fact I think if you read through the books the reference to how the Humani worshiped the Elders as Gods comes up a few times.
As for Sara and Richard Newman being kidnapped I think that comes up when Dee is talking to Mars about helping him.