Board Thread:Warhammer 40k General Discussion/@comment-14745711-20130906234048/@comment-192.138.82.196-20150330185253

Messenger of the Lion wrote: But, if you read Dan abnetts Legion, you will see that if Horus had won the heresy, he would rule for a small bit of time, before the imperium implodes and dies, denying chaos any chance of victory. But, since he lost, the imperium is slowly becoming more corrupt, torn apart, and twisted. In the book it says that with the emperor as the winner, the imperium will slowly break apart and chaos will win. So, just like in fantasy, chaos will win in the end....... If only Horus had won....... Some of the primarch a that were loyalists would have given in. He wouldn't have given himself over to chaos. It wouldn't have been that bad....

The Cabal told that story to Alpharius/Omegon but it can't be taken as gospel simply because of the source(within the story). It's entirely possible it was all made up to sway Alpharius/Omegon to the side of Chaos. There is however, no gaurantee that EITHER outcome would be true.