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We're the 3rd primarch found. Horus only brought him a planet and some gangsters, Russ gave him a cold planet of barbarians.
We're bringing him a fully capable stellar empire, a fleet of ships, effectively a portion of our own legion of space marines with experience in conquering planets, billions of humans into the Imperial/Mechanicum fold, and defeated not just some local planetary threat but entire fleets of alien foes. We're, next to Dorn and maybe Guilliman, the most capable primarch of literally diving into the Great Crusade and even accelerating it.
And all he wanted to do was psychically check our loyalty. Not even so much as a good job. If we were Perturabo, we might hold the biggest grudge in the Galaxy for that.
Good thing we don't have time for that nonsense, there's the Machine God's work to be done. Envy is an illogical and wasteful weakness of the flesh. Plus if we don't like a feeling, just tuck it away behind an emotional vault.
I bet even Talos probably is cool with it, if anything its an opportunity for piety. To be loyal even with or without praise, and to derive satisfaction from the act of a job well done in and of itself. A machine needs not the praise of men to function loyal and true. Flesh is as grass, the sweet words of men are as flowers. Grass withers, flowers fade, but steel and the words of the Machine God abide forever.
Besides, we're going to host the BIGGEST party on Mars has ever seen. Possibly even a wedding