Despite it not showing up in Black Panther as widely suspected, the Soul Stone COULD still be in Wakanda, powering the Vibranium stock in the country's vast mine and giving its powers to the Heart-Shaped Herb that in turn powers the Black Panther.
How else do you explain such a vast amount of power?
Well, it would make a lot of sense, but there's a big sting in the tail because Ryan Coogler has debunked it in a conversation with IGN:
“I love the Infinity Stones as much as any comic book fan, it’s just Wakanda already has its thing, which is Vibranium. For us, that was special enough, so to throw in something like another special thing didn’t feel right. It felt like we should stick with our one MacGuffin for the country and explore that, let that be the important thing because, frankly we didn’t need to have another piece like that. [Marvel Studios] never really was interested in putting a stone in there, either.”
That's not to say Marvel won't be interested at a later point (ie Infinity War), of course, but you'd think they might have seeded it consciously in Black Panther if they intended to go that way. To learn that they weren't interested at all is pretty devastating to the theory.
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