Leaving aside all other debates: anyone noticed Seth ALSO had an awakening as a god, that ...

I thought it was just because that was thousands of years ago.
Seth is really old, so he might have forgotten.

But now that you say that, is not an impossible idea that something that he forgot happened before his awakening.

I don't think he ever had anything with Osiris, but this idea of "his past that he forgot" is really interesting.

I think they might have been closer friends than they were later, but not actually lovers.

Honestly, I'm more curious about his relationship with his parents; particularly his mother (Nut- the goddess of the night and sky). She has been mentioned a couple of times now (in a longing manner) and it makes me wonder if the reason why Seth is so obsessed with the notion of family is that he never received love from his parents. This could have also fuelled Osiris' obsession with Seth if Seth only received love and attention from Osiris, he would have become extremely dependent on him. My theory is Seth was super dependent on Osiris as a child and made Osiris his whole world, but as Seth got older met more people and became stronger he grew more and more distant and independent and this is what set Osiris off and triggered his obsession. He also possesses red hair and eyes which are considered 'a cursed colour' and 'the colour of blood.' So I wonder if the red is meant to symbolize his origin or his future (like was his birth the sin or is he the forthcoming of sin kind of thing).

Honestly I don’t think this is the case. It’s implied with Isis’s scenes that he’s younger than her (and likely younger than Osiris) in terms of ascension. It seems like Isis took on the role as a caretaker and maybe even a motherly figure to him (some of this is implied in the story with how close they were and her flashbacks while some of it is also based on special FAQ stuff that implies she played that role for him).

Just left a comment saying something similar (I theorize Isis played a parental role in Set’s life’s based on what we know of their past relationship before Osiris raped him). It makes sense that to a demi-god Set they were like parents and even with the awakening those feelings lingered before slowly fading.

Given what we saw with him and Anubis it’s pretty clear this story doesn’t shy away from pseudo-parent-child stuff either. It’s plausible that part of why Osiris desired Set was him basically trying to rekindle that feeling of having him depend on Osiris.

Me too. I guess the four of them were really close as siblings and friends,

That's such an interesting theory and it makes a lot of sense.

Your theory of "Isis playing a mother role in Seth's life" makes a lot of sense, specially based on the last chapter we just read.

The fact that she decorated an entire temple with Seth's history and kept all of his letters shows that she actually was really lovely to him before everything.

Also that scene, where she thinks about exposing what Osiris did to Seth to show Osiris' real face to the other gods, but stop from doing it when she sees Seth and thinks he will feel humiliated, show that perhaps, they had a strong bond before all that mess happened.