One way to look at the overall matter is to understand that that at the rough time of the writing of NT books, there was and had been much conjectural thought about the accounts in the OT, especially in Genesis, that are tantalizingly brief and leave lots of questions unanswered. Jews had been running all kinds of ideas into discussion on these topics, and their thoughts are often found in the Apocrypha, the Pseudepigrapha, Josephus, and the philosopher Philo, as well as writings from Qumran/the Dead Sea Scrolls. Sometimes they are even found in classical sources of the Greeks and Romans.
On the issue of the role of the angels on the one hand and Adam and Eve on the other, there are statements in 1 Enoch (2nd cent. BC and later) that a sinful angel named Gaderel (or Gadeel) "misled Eve" and was responsible for revealing to humans how to make weapons of war (69.6). In the Wisdom of Solomon 2.23-24 (perhaps slightly earlier, 3rd-2nd cent. BC) there is found the statement that God had made humans in his image, "but through the devil's envy death entered into the world." If we accept that many Jews viewed death as the result of Adam and/or Eve's actions, then the connection with the snake in Eden is not far off.
Therefore, the statement in Rev 12 is not out of place, given what was happening in the Judaism of the time. Viewing it as "secret" is indicative of not understanding the historical issues going on at the time of the NT writings.
BTW, the fact that 1 Enoch's writer(s) does (do) not agree with the "name" Satan means nothing. Those responsible for that book loved to assign names, even contradictory ones, to all sorts of angels and demons.
