I have no name for I am but 2 days old ;).
The second light novel has Dante traveled to an alternate dimension/timeline. According to the summary I read, he interacted with a version of Vergil that went good.Who wants to see Vergil fall into a dream state where his question is answered in a what-if scenario?
“that day, if our positions were switched... would our fates... be different? Would I have your life? And you mine?”
It can happen while Dante and Vergil are in the underworld. Their roles are reversed in that dream.
In fact this dream would be a sign for Vergil that it can be a path of redemption for next game. When he fights alongside his son.
So that would be another way to do that.
Vergil meets another version of himself that was good but learns his other version suffered from similar flaws. By interacting with this supposedly better self he gets to see it's on him to make the effort to be better.