This is a very interesting case of role-reversal, a "what-if" for a tumultuous period of the Imperium. Well written.

I would have loved to have seen this expanded somewhat, going into some of the battles that the other 'loyalists' would have fought (such as Perutabo, my favorite of the Primarchs) as well as expanding some of the backstory of the Primars as they deal with this rebellion.

But otherwise, credit is what credit is due, so well done!

It's not bolded, you may have an issue with your screen my friend.

Well, maybe you shouldn't bold everything... make it kind of distracting to read (Is that important? Or is that?)

Good plot. I want to see how this turns out.

nice job.