Most of the fist exemplars became the 2nd incarnation of the imperial fists, alongside members of other successor chapters after the original version of the chapter was wiped out. This was able to be done due to the last wall protocol.
I might be wrong but didnt before he turned traitor Konrad tried to warn Rogal about the traitors and Rogal didn’t want to hear it so he tried to beat him up ? Also I think perterabo wanted the same thing Rogal did they wanted to build art and things that didn’t have to do with war but the big difference was Rogal was given the opportunity to and perterabo was told to go back to throwing his sons into a meat grinder Ps y’all should check out major kills video on the iron warriors
You guys should check out lore channels while you wait for more TTS. Baldermort, Luetin09, and Oculus Imperia are my particular favorites. All got great voices. Baldermort tends to do basic info with creative stories of his own creation and his gravelly voice really lends itself well to the 40k verse. Luetin tends to do long form essays detailing a lot of information, so he often does really long videos as a result sometimes, and his voice is great for falling asleep to if you just put on one of his long videos. Oculus presents himself as a scholar/scribe of the imperium to go over more in depth information, just as good as Luetin, if not better. Very calming voice as well.
Y'all should watch Baldemort's three-part series on Rogal if you haven't already. [Rogal Dorn; Praetorian of Terra] I don't know if it'd be good reaction content, considering it's more of an audiobook-type format, but I and many others think it's one of the best when talking about Rogal and his experiences pre and post-Horus Heresy.