Okay kids, it’s time we took a look at this image of the Signless and his apostles.
Now how about we just have a quick run-through of the symbolism used in this page.
All the Ancestors are relatively featureless - a trait typical of the albino lusii, faceless guardians and semi-tangible First Guardians throughout Homestuck. But on each of them, there’s a main element which stands out for symbolic reasons.
The Dolorosa’s eyes are visible in a bright yellow because she’s a Rainbow Drinker - glowing yellow eyes are an important trace of said Drinkers.
The Psiioniic’s eyes are, of course, visible in their red and blue tones because this eye mutation is a prominent part of all the Captors. It’s also possible he’s wearing a lens or visor of some sort, which would be coloured due to the fact that it’s part of his clothing.
But then there’s the last two.
The Disciple is the only one without eyes here. The Signless, despite having nothing important about his eyes in particular, does have his eyes drawn on, in bright candy red.
The only real reason why the Disciple’s eyes would not be shown would be that her hair is obscuring them. But guess what? The Disciple’s hair is explicitly drawn here. The Disciple’s the only one with drawn hair in this image, and it’s specifically shown to not be obscuring her eyes.
So why would the Signless’ eyes be shown, especially in that colour, when they’re supposedly just the same as Disciple’s (only red), whose aren’t shown?
Well what other character do we know with prominent, bright red eyes?
(That’s Terezi, by the way)
And for what reason were her eyes red?
They were burned, which led to her being blind.
Now, we know that Kankri, who is genetically the exact same person as the Signless, was a Seer. Terezi was also a Seer - and as Karkat and Latula were both Knights, we can assume there was some sort of fateswap going on between the Pyropes and the Vantases.
So what if the Signless was blind?
Additionally, the Signless was a prophet.
If he was blind, that would make him a blind prophet.
So, long story short - what if the ‘Blind Prophets’ that Terezi holds in such high regards are actually a corruption of a singular Blind Prophet - and that Blind Prophet happened to be the Signless?
We know that Redglare was a follower of the Signless cult, at least.