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-It goes without saying that being a Primarch (especially one from Perturab gene), his abilities to accumulate knowledge are great and will increase slowly with time.
-Being recipient of the memories of 4 Primarch, their tactics, secrets, skills and strategies as well as those used 10 millenia later, he would be a devastating opponent/powerful ally/incredible asset to the Imperium.
For Information his Primarch Memories are from:
Late Great Crusade Hrud Campaign (Perturabo)
Siege of Terra (Alpharius-Sanguinius)
War of the Beast (Vulkan)
So he know plenty of Secret stuff. Some you may suggest indeed. Your imagination and lore knowledge Is appreciated.
Coupled with 42K tech & Votann stuff, it is indeed dangerous prospect to have this Primarch as enemy, If he mature properly.
(Simply if he get the Blackstone Fortress, seize Cadian style pylon to use empathic travel or mess with the warp, or retrieve artefacts like Speranza...)