>>281520574
Sure, but there have been instances of it, but Oda likes to keep things mostly a secret. I'm 100% positive Oda planned for Luffy to represent the Sun God vs the Satanic ruler of the world from the very beginning, there's too many thematic sun references for him to not have planned it.

As for Luffy having explicitly the Sun God Devil Fruit? I'd say he at least has planned it since the time skip.