be loyal to what matters
Not sure yet to be honest, tbh i would prefer nero be related through my other idea
Of sparda having a twin, not necessarily dante but a twin who had offspring who are the dad of nero, making him dante's cousin rather than nephew
But that is way too outside the box
Maybe but you should explore it further. I don't think it would change 5 that much. 5 doesn't really explore Nero's relationship with vergil that well. It's crammed in at the end and not explored well in either game.
My initial post was varied and went too far for some. So you could go as far as you want. If you wanna tell other stories after 4 but before 5 that's also an option.