Now, you know why Kishi killed off Neji. This leads me to believe that Kishi bringing in the whole reincarnation plot, wasn't planned, but rather spur of the moment. It'll also explain Kaguya's sudden appearance out of nowhere.
In the first ark, Naruto was a fluke, that wanted everyone's respect. This is where we got our hope for him. However, after the first ark, Naruto became less & less from the first person that he was in the beginning. Things/situations just started aiding him out of nowhere & I don't think many of us gave it thought until this whole reincarnation bit. We were told that Ashura is the base of what Naruto went through, just as per say, Jesus would be the base of what believers may go through.
This means, that although Naruto may have had the heart to succeed, things were made for him in his favor...more specifically the nine tails. Without the nine tails, Naruto would've been dead a long time ago, yet the nails was a means to making sure that Naruto would inevitably reach that fate of almost death & meet the Sage of 6 paths. This was the only way Naruto would ever see him.
This means, Naruto (Jesus), had Hagoromo (God) watching every step he made & guiding him where he needed to be, according to his will & he made sure that Naruto would succeed & being that what Naruto went through, is a cycle of occurance, this means that he was predestined, just as we were told. That is why he's the "child of prophecy". Jesus was called similar.
However, Naruto isn'tthe only ccharacter that goes through what Ashura did. We also have Guy, Rock Lee, Sasuke, etc.
Thus, Neji became the sole target of Kishi's new found plot of incorporating that particular religion into the story.