Odin is enhanced by Gungnir, Galactus by Taa 2, Celestials by their armor, etc. The origins of power are irrelevant.

That being said, I wouldn't put Thanos at skyfather levels until we get a clearer understanding of the power ups he received after The End. During his all to short solo series he shoed some pretty impressive abilities, but his levels are still rather vague. He's certainly a top tier teambuster, boardering on low end skyfather.