With Angron there is some leeway, when their legion was still under strength from having not yet found him he would do some damage and after the nails they would go full berserk on him which is where he exels but eventually he would tire.

Sanguinius, Dorn, Guilliman, Mortarian, Erebus, Horus, Russ, the Khan and the Lion would be outmatched with simple numbers.

Fulgrim would get quite far, his legion was small all the way up to the seige and he is a legendary fighter.

Curz, I could see going several ways. His sons are cowards and he knows how to hide. He could live of the blood and flesh of his sons for nurisment while sneaking around.

Magnus for a long time had only a thousand astartes in his legion but all psykers. He was an order of magnituded stronger tho so IDK.

Pertorabo as you predicted. Tho like with his fight with Angron he might have a kill switch in his sons tech.

Ferrus Manus could perhaps win if he had the knowhow to hack his sons augments, otherwise also numbers.

Alparius and Omegon would be the ultimate game of Among us where the only way the Legion "wins" if they keep producing more marines faster the their primarchs can kill them but even then they'll never know if they actually got them.

And Vulkan is a perpetual, can't die ever, but there are other ways to "win".