I explained it reaaaally poorly in the comments but the whole thing connected for me when Sun Wukong says: "Aren't you sick of living in my shadow?"
(Mind you, the whole story of JTTW was very vaguely written in my head when I started watching Lego Monkey Kid. So when Macaque came and did all he did to MK and Wukong, I didn't consider the original story and it's plot to figure out their past. I know, I'm dumb. But now, I've got the power!!)
For anyone that was as lost as I was, what Macaque tells when he's posing as a storyteller is partially true, though he leaves certain...details out.
Turns out, there are 4 celestial monkeys that don't fit into the 10 basics categories.
- Sun Wukong, the Intelligent Stone Monkey
- The Red Backed Baboon, prospect of balance.
- The Long armed Ape, wise of the universe.
- The Six Eared Macaque, oracle and fortuneteller.
JTTW tells how, after Wukong was kicked out of the group after killing some bandits, he just dissapeared. Some days later, he came back to offer apologies to Tan Sanzang who, obviously, said no, so Wukong beat the Monk and stole all of the group's stuff. When Sha Wujing (Sandy) went to his mountain to confront him, he found out Wukong planned to do the whole journey with a group of clones of the Monk, Sandy and Pigsy. Basically wanting to reach illumination by himself.
Sandy, seeing Wukong was beyond all reason, went to the goddess who was...basically Wukong's legal tutor to ask for her help on changing the Monkey King's mind. Turns out, the Real Wukong was with her the whole time since he was kicked out.
Long story short, after both Wukongs fought endlessly through earth, the celestial realm and the underworld, they ended up in front of Buddha, who unmasked Macaque. Right afterwards, Wukong killed Macaque for stealing his identity and his monkey army.
Why do I explain this? Aside from cutting everyone to speed on JTTW and it's lore.
Well...do you remember all those jokes Macaque makes about his "living streak"? What finally put the last nail on Macaque's hatred (or heartbreak) on Wukong was, basically, that Monkey King killed him after both of them were considered two powerful entities feared on all realms.
"Their light, a protective glow, shining upon the world. Together there was nothing that could stop the two of them. Either in the Celestial Realms, or on Earth..."
With Macaque at the brink of death, he made an Oath to the Lady Bone Demon to be brought back. And we all know how that went...
Knowing all of this makes certain scenes cut deeper than they did at first, doesn't it?
"You've got Lady Bone Demon powers, huh? I mean, it is in brand for you to have the worst version of someone else's powers"
"...You always had a "Sidekick" kinda vibe"
"Mk: You're...not Sun Wukong
Macaque: heh...I get that a lot"
At first I kinda just interpreted it as "Yeah sure, they look similar" and "Looks like they have a heavy history together" but it was always confusing to me how certain thing tied up.
The series gives you hints, but still nothing definitive. Just the idea that they were friends (cofcofloverscofcof) and something involving Macaque taking Wukong's identity and then Macaque dying. But having a bit more of backstory, makes the whole drama more effective.
Mind you, haven't watched Season 4 so if anything's there, I don't know at the time of writing this essay.
So yeah, you're welcome for everyone that was confused.
P.S. A little thing I want to point out, even though it is not ShadowPeach related, is about Dragonfruit.
Mei calls Red Son "Red Boy" as a way to mock him. She's accidentally dead-naming him. Red Boy is Red Son's name from JTTW.
I like to think Red Son made the change so his affiliation with DBK was more obvious and to wield it as a banner of sorts. And Mei comes around just accidentally calling him by his past name, that why he's so mad when he's called Red Boy.
Or at least, that's my theory...