The Rise of Imperium: The Last Oath

we all know the tale of the imperium,but what if the 2nd and 11th primarchs were still around what if the 2nd would maybe travel or regress in time due to warp shenanigans what can he do with his life will he be able to bring glory to the imperium or fail and become its greatest enemy. warning the regression part is revealed further in the story and will not be shown at the start