Uh, how about no? There are no such voices :/ The only voices you hear are those of Eva and Sparda. Evidence:
Starts at about 9:20.
Dude, Malik already told you that in those painted flashbacks you can clearly see a Dreamrunner holding back young Dante, so don't try telling me there weren't any demons involved.
And that's important because...?
That's no where said in the game. The only thing that is mentioned is that demons can have human vessels, however that only means that they are linked to a human body, enabeling them to interact with and wander the human world in a direct way. Having a vessel doesn't make them actual humans per se.
What are you even talking about? It was CLEARLY said and shown that Mundus marched into their house, and just in case it slipped you,
Mundus is no politician or government official, he's just a banker collecting blackmail on government officials wich allows him to have a certain degree of control over them. And again, there was no SWAT team, so saying the government was involved in the attack has no canon basis whatsoever. And how can you tell that Dante wasn't in Limbo at the time of the attack? It is very much possible that he was, even likely given that a Dreamrunner could actually get a hold of him. Furthermore, why would Dante refer to the government as demons in the first place? It makes no sense.
Eh? I don't really get what you mean. Like, would you have wanted the game to say "Btw, there's a comic that is canon to the story, be sure to check it out!"? It was officially published and lisenced, so unless Capcom makes an official press statement and declares it to be non-canon, what is being shown in the comic is very well canon.
1. Why a replacement for Mundus was needed: To keep the balance, I'd assume.
2. Why his heir was of such importance: It is possible that there wasn't even that great of an importance to him, but that Mundus simply wanted an heir; be it out of boredom or as a just-in-case thing.
3. A group of people to take over for Mundus: Now where did you get
that from? It is quite possible that there literally wasn't anyone suited for the job, which leads to our next point:
4. Why Vergil?: Maybe he was the only one that was powerful enough and willing to take over?
He was 7 when he could have recieved his last potential training session.
7. When can you start training a kid? When it's 5, maybe? I doubt that you can fully master the art of fighting in merely 2 years, unless all you do is train, and I doubt that either Sparda of Eva would have wanted their kid to grow up like that. And then he got his memory erased. So how much of the training he may or may not have recieved would be left?
Uh, you know, if there would have been a better place then the orphanage then I'm pretty sure Sparda would have brought them there. If anything that indicates that Sparda at the very least
thought that he brought them to save places, it just didn't play out so well for Dante. And if you think about it, it really does make sense for Sparda to think so - no-one that isn't a demon would have ever thought that a little boy who looks perfectly human might in fact not be human, and even for the demons it would be difficult to impossible to find out which one of probably thousands of boys at about their age would be the one they're looking for.
Well, if you're listening to what Eva says during Home Truth, especially in what voice she says it - "Sparda! They're here they found us! [...] How did they find us?!" - it seems that they indeed thought that their house was alredy safe enough. Maybe it even
was filled whith traps and protective magic and what not, yet they still couldn't make it.
Let's play a little game, shall we? Try to thinkg of a place other than the orphanage that would have been even safer for Sparda to drop his kids at. Keep in mind that Sparda and Eva both were outcasts of their own race. GO!