Hm, I believe you guys are getting somewhere with the plot being Dante is interested in Kyrie.. BUT.. Lets not forget.. Dante isn't the main character in the game.. So the plot couldn't really have Trish and Lady making an appearance just to see that Dante is interested in Kyrie and watching Nero protect her.. And I think Kyrie isn't Dante's type at all.. lol. x]
And about the son thing, etc.. Capcom didn't like the way DMC2 went after letting it out.. And everyone seemed to not like the game at all! Plus! In Viewtiful Joe for PSP I believe.. Dante makes his appearance and Joe asks about what he did in DMC2, on the island and Dante replied, "What island?" Or something like that.. =]