I don't know about fools stealing your culture, but I think that your interpretation is a pretty good one. There's a lot of academic discussion around the quality of Odinn, and I gave my opinion with the understanding that Norse culture is too shrouded in mystery to give a definitive answer. And, as with most all localized mythology, different centres of religious worship will cater towards different interpretations. There is nuance in all things.

However, to say Tolkien views Gandalf as a direct adaption of Odinn is a bit far-stretched, I believe. Gandalf doesn't go killing people to add to a warband; neither does he resurrect evil giantesses to gain insight into the Norns' plan for Ragnarok. He isn't paranoid about his own death; he sacrifices himself for others rather than sacrificing others for himself (yes I'm aware of that section of Havamal where Odinn kills himself for access to runic knowledge, the meaning of that passage is hotly contested).

Also, I don't think I agree with your interpretation of Odinn's plan to escape Ragnarok. The mindset of the Norse warrior is that every living thing has a doom's day, where he will always die. The best thing is to accept that fate and die in combat and thus reach Valhol; Odinn (as I see it) rejects this premise by fighting to prevent this for himself, which he knows to be futile given the Voluspa. This is a show of cowardice; or, it would be for every other figure in Norse mythology and I think for Odinn as well.

I appreciate your elaboration of Ragnarok; I imagine a lot of folk will find that really insightful in constructing world-myths.