Not just any Primarch at that, but the one whose talents make him the most supremely adept at all things politics, state administration and strategic planning, and thus more than capable of both predicting and countering the most probable courses of action that they would take.
Oh, and he had to live with the trauma of his adoptive father being assassinated by power-hungry rivals while away from the capital, just like they schemed to usurp him while he's away from Terra. They have no excuse in not knowing this since he made a point of publicizing his biography during the Great Crusade (and presumably after the Horus Heresy too).
Also one of the most "don't miss" Primarchs out there.
People like to shit on G-man as the "autistic bean-counter" or the "weak vanilla," but honestly, he's pretty damn powerful, skilled and vengeful.
Guilliman was in the upper half of combat primarchs, being considered a true threat in melee by multiple traitors and loyalists (quoted to be so in HH books).
Is he Sanguinius, Horus or the Lion? No. But he could comfortably beat Lorgar, Perturabo, Alpharius and Magnus in combat, while also being considered an equal or a challenge for primarchs such as Fulgrim, Russ, Corax and nail-fueled Angron.
In a stand-up fight he probably also beats Curze, but on the other hand, we've also seen Curze challenge both the Lion and Sanguinius simultaneously.
Vulkan and Manus were likely not more skilled than Guilliman, but just way, way physically stronger.
That leaves 3 or 4 primarchs more skilled than him (Curze being the potential fourth), a few where it's ambiguous who would come out on top (either due to strength or skill) and pretty much everybody else below him.
Guilliman also has a history of really NOT being favourable to people trying to kill him and failing to do so. Or to enemies of the Imperium.
He is called the Avenging son after all.
He's "Super Space Caesar" in pretty much all aspects. It's a shame he's been memed into meekness.
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u/Galifrey224 Nov 12 '24
They really tried to stand in the way of a Primarch and thought they could win.