I have a vague theory about the primarchs.
I believe that they are man made "demons"
That they are 20 ideas given form in the warp by the emperor and then given flesh.
What is the basics of the theory?
Firstly that the where was only made 20, and the was on replacement made for the 2 "lost"
If the primarchs are just super human made from advantage genetics, then I would be possible to make more when the process was discovered.
Secondly. the emperor did not kill and then clone Angron when he was discovered and considered flawed.
The reason for this 2 things could be the nature of the "spirit" of the primarchs.
If they are mortal man made demon given flesh, then perhaps it impossible to transfer the existing spirit and impossible to make a new one.
Reforging the flesh is possible, but useless without the "spirit"
It could also explain why Fabius Bile is having a hard time remaking the perfect primarch.
He got the cloning down, but lags the binding of the "demon" to be truly successful.
Now what do you think?
Is there some merit to this vague theory or is it just me seeing patterns that are not there?