One of the more interesting theories about the Magi is Chuck Missler’s, which IIRC is that Daniel had been the chief of the Magi when he was in Babylon. As a result the Magi preserved his writing including his prophesies, which they used as a guide nearly 500 years later.
yet the Magi were Zoroastrian priests. Daniel couldn’t have been the chief Magi unless he had dualist beliefs and not Judaic