About M'Baku and the challenge
Maybe I am just reading too many articles by really dumb people, but they seem very confused by Winston Duke's statement that M'Baku is King of Wakanda at the end of the film.
... I thought that was clear from him challenging for the throne without any challenger? You guys got that, right?
But I also think this is a reward for a character who has always kept Wakanda's interests ahead of his own. In the first film, he believes Shuri's technology is ruining Wakanda and that is why he challenges T'Challa.
T'Challa could have killed him, but instead asks M'Baku to yield after Ramonda shouts "show him who you are".
M'Baku goes back to Jabari-Land defeated, but when Ramonda, Shuri and Nakia come to HIM to become king and take the Heart-Shaped Herb--which is what he wanted at the beginning of the film--instead he tells them that T'Challa is alive, knowing T'Challa can unite Wakanda in that situation better than he can.
He pretends to be above helping T'Challa fight Killmonger, but he does show up at the end. The fate of Wakanda is important to him, even if he pretends to only care about the Jabari. He even shows up for Infinity War and Endgame. (He is even there running at Thanos when everyone else has magic weapons and armor. He just has wood.)
He becomes an adviser to the Throne, and though his "bald-headed demon" line is obviously a joke, it's clear that M'Baku always says what he believes, like when he tells Shuri her mother would not want her to go to war with Talokan. In that scene, he is more connected to Ramonda than Shuri is. (And it could be seen as Shuri's reliance on science and technology that keeps her from seeing things the way M'Baku does.)
And the final fight with Namor is a mirror of T'Challa's fight with M'Baku. Killmonger asked Shuri if she was going to be like her brother or take care of business like him.
She chooses to be like her brother. She choses to let Namor yield (and that's when she does hear Ramonda shout "Show him who you are!" from the Ancestral Plane. The same thing she said to T'Challa in the first film.)
Who Shuri and T'Challa are is unifiers and protectors of Wakanda.
I see Shuri's choice to NOT challenge for the Throne (indeed it must be her choice because M'Baku would not have a Royal Talon Fighter to arrive in without her giving it to him--it may he Sunbird, Shuri's personal plane, that he arrives in now that I think about it. I have to see it again) as a way of acknowledging that she is not ready to be Queen yet. She still has healing to do in Haiti with Nakia. And also, that she almost made the WRONG choice and nearly got every Wakandan on that boat killed by Talokinil. If she hadn't brought Namor back alive, they would be dead.
And rather that worrying that M'Baku will become King of Wakanda and cause destruction, she knows that he will keep the country together, as he has done since the first film despite all his protests.
In a way, it's very hopeful that M'Baku becomes King because it suggests that Namor can also learn from this conflict with the Black Panther as M'Baku did. But it remains to be seen if he will make better choices in the future.
ETA: I just can't express how much I love what has been done with this character. When they first announced M'Baku would be in the film, I remember being disappointed because the character has traditionally been a stereotypical villain called "Man Ape". He's backwards thinking in regards to technology. He's big and dumb.
But the writers and especially Winston Duke have brought such lovely humor and heart to him that he has become a favorite and I am HAPPY he is King. I don't for a second worry what he will do (thought he might say some inappropriate things).









