can you go into more about how Caliborn/LE's powers dictate the entire Alpha Timeline please?

The Alpha Timeline seems absurdly arbitrary at times, but when you look at it, every single thing that happens in Homestuck is shaped by Lord English. The Alpha Timeline is basically the sequence of events required to Make Him Exist, since Lord English is Already There, and he’s the Lord of Time, everything becomes an intricate Loop meant to make him come into being.

Davesprite’s Timeline isn’t Doomed just because John Died- It’s Doomed because Cal was prototyped, and Cal is a necessary compotent to make Doc Scratch. The Scratch and the Kids reaching the new Session are absolutely required to create Universe C where Caliborn will be born in the first place- Thus Condy is sent to both Pre and Post Scratch Earth to supervise and pave the way for the Universe’s Creation, even though Condy dislikes English in general, she’s still his Handmaid after all. Lord Jack was basically fated to be defeated, because his defeat gathered Gamzee, the Crowbar, and Yaldabaoth from LOTAK, which are all things Caliborn would later use during his Quest. Gamzee is supposed to become part of Lord English, so he cannot die, no matter how ridiculous his wounds are or what happens to him, he has to reach Caliborn.

And Calliope is also culprit in shaping every event of the story! She’s hidden within the Bubbles, waiting, so Lord English chases after her, destroying everything in his path- This kills the Horrorterrors, which makes them seek out for help from the Beta Kids, which leads to the plan to Blow up the Green Sun, which ends up creating it instead, and as the Universe Ends detonating the Tumor, Lord English is born in the first place.

The search for the Juju granted John his Retcon Powers, which was the thing that made them be able to reach Caliborn in the first place, trapping their Souls in the Juju that would rather allow John to zap around, and also causing Caliborn, half of Gamzee, and ARquius to become trapped inside of Cal before being Voided Out- Making the search for the Weapon to destroy Him the trigger to actually allow his existence in the first place.

Everything that happens in the story is shaped by either Lord English, or one of his collaborators- Doc Scratch, Damara, Gamzee, Kurloz… And so the Alpha Timeline is paved as a Time Loop Lord English has created, but everyone else needs to follow strictly lest they become Doomed. He basically takes away the characters’ Free Will by his mere existence, which is why I like an ending taking place in a Non-Alpha Timeline, and where the Kids don’t necessarily need to fulfill the Masterpiece and go after Caliborn- They’re basically breaking out of the Loop thanks to John’s Retcon Powers. At least that’s how I like to see the Ending, we’ll see when the Epilogue comes around how accurate that is.