In a business where you can go a decade of paying your does, maturing character, and jobbing I don't see how "organically grow" doesn't apply here. Reigns has been on the main roster not even five years. What back story does he have? We know that he was in The Shield and there was no leader of the three man squad. He barely spoke and usually delivered the final blow, or power bomb. Fans were gravitating to Roman Reigns, not Rollins, and certainly not Dean. It's how his whole over push started. Do I have to go over nearly four years of history for you?
Reigns got hot, and once they realized that The Shield were done, it was time. Roman's push started the moment Seth Rollins became HHH's bitch. Fans have rejected Reigns, or are you in denial of this? If Roman loses to AJ and shakes his hand at the end of the match I think it sends a different message to a certain group of fans. Styles is more over as a "face" than Roman is right now. Working on passing the title to AJ makes Roman look like a true pro. Now, I don't see Styles defeating Reigns clean. I see Anderson and Gallows coming down costing Roman the match. Again this leaves Styles looking like he was part of it. I could certainly see Roman and Styles vs Doc and Karl down the line after the PPV.
We know his back story in kayfabe he's a guy who got into the family business but wanted to carve his own legacy and not live off of his genetics. That's from the post Rumble Raw.
We also know being able to provide for his daughter is one of his motivating factors. That's in the Bray Wyatt feud.
We also know his ultimate goal is to be THEE GUY on his terms as seen from the Authroity feud until now.
He has organically grown in a kayfabe sense as we've uncovered more about him as time has gone on. But of course actually paying attention to what his character does would get in the way of being able to say people don't know who he is. And he has been over as a face, now he's over as a heel so they should align his character to represent that.
As far as losing to AJ and shaking his hand you and I both know that's not going to endure him to the "not organic" crowd. The moment he shakes his hand it will be "omg look at them trying to make us think he's a good sport about losing his spot" Reigns is under different rules. The "not organic" crowd shifts what his character should be doing at every turn.
1st it was can he even wrestle a singles match
2nd it was can he wrestle over 15 minutes
3rd it was can he add moves
4th was can he cut consistent good promos (still can't do that to be honest)
5th was he needs to be more vulnerable.
6th was why is he so vulnerable he needs to kick ass.
7th was why are they having this face beat up HHH why not just make him a heel
They need to just run with him as THEE GUY and if the fans want to Boo let them Boo him