Must I not?
To me a proof is complete. A bunch of inadequate “proofs” do not add up to one good proof.
I might have understood “One more step in the proof.” or “one more part of a proof.”
But all I saw was an assertion about stars. So I didn’t and don’t see it as THE proof or A proof or any kind of proof at all.
One pretty good source for information on Revelation 12 is here:
http://www.biblrytr.com/revelation11.htm
He gives a very good synopsis from which you can study.