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It might explain why the Primaris units can't cope with mixed loadouts. Alpharius is still using Heresy army lists.

I've got a conspiracy theory that Olden Demon is actually just 3 dachshunds in a trench-coat with some very convincing human makeup applied.

"My last tool. My last hope."

Who is the last Primarch? Omegon.

Nice theory! There is however a slight oversight. The Ultrasmurfs would immediately recognize the deception when they notice the lackluster pace of paperwork being done.

Guilliman being super mean and weird out of nowhere and suddenly healing chaos wounds honestly feels more like Emperor possession than anything else

I HAD THIS THOUGHT A FEW WEEKS AGO!!!! Alpharius is scouring the galaxy for where he stashed the REAL Roboute, so that he can switch back and stop having to carry the whole galaxy on his shoulders.

Guilliman is Paul McCartney?!

Edit: You've convinced me.  Your theory makes the setting more fun.

Won't hold a match to the theory of: The Emperor is only as strong as he was/is because the Orks think he's "dead ard"

Considering he had his own empire, its possible he saw the coming failure and decided to try and preserve his own little hatch of himanity in Ultramar, but later realizes he needs BIG E and the astronomicon so he just... sets himself up to be the next Horus but on BIG E's side.

“That… was not my brother.”  

Not gonna lie that’s a Starwars level epic family relations plot twist..  

..there’s no way modern GW would have the balls.

Primaris are bigger than standard marines. Alpha Legionnaires are noted to be bigger on average than other standard marines and are known for infiltrating loyalists for their own purposes. The Legion stole the data on the Primarch project the Emperor gave Corax to rebuild his legion after the Dropsite Massacre, the results of which produced marines that were bigger, faster, and stronger than a normal space marine. The Alpha Legion developed special bolters and ammo prior to the Heresy, intended to be stronger and more penetrating than standard bolter ammo. Primaris bolters at release were mechanically stronger than firstborn bolters.

Primaris marines make up well over 50 percent of all loyalist marines in existence, and every month more are made and they are engaged on every front and embedded in functionally every sizable battle force.

Make of all of this as you will.

I'm with the Occam's razor on this. Sadly, too much bad writing currently for any theory being deeper than a damp pavement, except by pure coincidence.
That said, how about this - what if the Alpha Legion hydra symbol has three heads because their primarchs weren't twins, but... triplets...?

The main problem is that alpharius and Omegon are the shortest of the Primarches, noted to be as tall as regular marines. Meanwhile Bobby G is taller than even a Primaris Marine.

If this became canon it wouldn't even be the most unhinged 40k retcon

I honestly like this theory alot, it makes a suprising amount of sense despite sounding completely wack.

You convinced me at the end with The Lion saying “That was not my Brother”

22:54: "Guilliman, Guilliman, Guilliman... And bits of sick" - Garth Marenghi's Grimdark Place

As an Alpha Legionaire i deny this theory, my father, alpharius, by the Great Horned Rat blessed be his name, died in that battle and we mourn him so much... all the time really. The event was harrowing for us. Still is even.

Roboute is such a great leader, Abaddon could never hope to compare, atleast as long as no one were to disobey and undermine Guillimans leadership.

The reading of the Emperor was literally spine tingling.

Also, love the vibe and humor of the video.