What If Loki is a Facsimile of Nika?
He claimed to be the Sun God. I will push this concept a little further and suggest that Loki can take on a facsimile form of Nika. This form is what convinces him that he is the Sun God, and he can create many of the same attacks Luffy does.
I may not necessarily believe this is what's really happening in the story, but it is interesting to consider. What if Luffy ends up fighting another Nika?
