Ok, i have a question; why Corypheus still wanting to travel in time one year after his victory, he already was a god and the fade frontier was broken, did he realized that he screwed it or what?
A second question: The seekers are said to be inmune to red lyrium, and Solas is a forgotten one, a being of blight, then why the hell both were infected with red lyrium?
Corypheus didn't get what he wanted. That's not said outright, but you can easily tell on a replay. One, he's not an omnipotent god - he has no power to do anything the entire quest. When he does appear (and you hear him appear) he arrived on his red lyrium dragon (you can hear the thump and roar). More importantly - and the codex entries show this one - the world was overrun with demons. Not bound ones like he plotted to overrun Orlais with in Abyss. Out of control demons that have devastated the land.
Corypheus utterly fails in the bad future. He isn't a "God" and the breach overran the world. He wants to go back to get the anchor - he needs it to close the breach.
I don't know where you're getting the point about Solas.