
The difference between Nagi and Isagi's development despite them working for a similar goal shows so much about them. Nagi doesn't push Chigiri to go beyond his limits and end up possibly injuring himself permanently but Isagi does and even encourages that mindset. Isagi is being someone that would use others with little to no remorse for their dream and is being more and more of a "demon king".
Anyway. Back to Reo and Nagi. In the recent BlLk chapters, Reo scored a goal and immediately apologised to Nagi but Nagi told him he didn't need to apologise and it was his fault for not being fired up. Nagi dell of the leader board and might he expelled from blue lock.. moreover, this chapter shows Nagi seeing Reo in Luna, but other fans who read Blue Lock made a theory that Reo might be the second Chris Prince.. I can't wait for future chapters.

I think even more than that isagi and nagi relationship is like Sae and Rin were Isagi is the prodigy(Sae) that inspire the genius (Nagi) but instead of The prodigy being broken it's the genius and we know from the itoshi brothers or even ego and noa how important that relationship is
As for the isagi demon king title I don't believe it really refers to all the arc of isagi but really nel isagi since it was God chosen emperor (Micheal Kaiser) vs Demon king (Isagi)

I wish people would stop belittling Chigiri's resolve at this point of the story. He has time and time proved that he's his own egoist and he doesn't need Isagi to push him either.
>Isagi is being someone that would use others with little to no remorse
I'm not even going to tell you you read the original blue lock manga, but you should try reading this one again, especially with the Hiiragi match.
Guess who believed in Ness' awakening until the very end. Guess who believed in Nagi's soccer when pretty much most of the people in that room thought it's over for him, including Nagi himself.
Yeah, it's Isagi. He really isn't the 'demon king' people wants him to be.
I'm not a big fan of how this ended up playing out. I feel like it would've been better if there were more chapters and if their characters were more fleshed out. I'm disappointed by how the author treated BDSM dynamics and how it ends up playing into rapey themes.