The Cross and Crown symbol predates Masonry.
Russell never claimed to be a Mason, in fact he's denied being one. Even the Mason's deny he was ever affiliated with them.
No, Russell believed the pyramid was a corroboration of the Bible. It was his belief -- as well as the belief of many Christians from various denominations -- that this pyramid is the Witness spoken of in Isaiah 19, that Jehovah had this pyramid built, and that the passages therein correspond to various features of the divine plan as revealed in the Bible.
