People have been suggesting since the 1870s that Odin is a later addition to the Germanic pantheon. The late-Victorian view was that original supreme god was Thor, who of course is a thunder god, and that Odin was parachuted in later as part of some broader social shift. I'm not sure if that's still the received understanding now, though.
I have heard of that theory but the flaw I always found in that is that I can’t think of any recorded references to Thor that really predate any mention of Odin as well with previous mentioned Germania being one of the earliest known references and both are in it. Also Odin along with Thor was the most commonly worshiped deity across various Germanic tribes which shouldn’t be the case if he was a later add on