Hi. I didn;t know that about it not raining. Never heard that before. as regards the second witness being John, in my opinion, no way he would be the second witness.
I believe the two witnesses are Elijah and Moses and I believe that because Hal Lindsay lays it out very consicely. You should check out his videos on the study of the book of revelation. He is currently studying the Book of Revelation.
Hal Lindsey