2) They fight versus each other whole game, so their final fight didn't look like "WTF they are doing?"
Maybe the DmC Dante against Vergil was intended to be WTF moment. Throughout the game, Dante and Vergil are shown working together for a common goal, even beginning to behave like brothers who look after each other.
But then when they fight over something so sudden, it is a surprise, like a sense of where did it go wrong.
Vergil seems to be surprised by Dante's sudden change and expected him to rule alongside him, but when Dante disagrees, Vergil feels betrayed. And because Vergil now sees Dante as an obstacle to his goal, he has to fight him.
In contrast to DMC3, the ultimate fight has been building up throughout the whole game. It's established that neither twin likes the other much and have been estranged for a year prior to the game beginning. It was inevitable that they would clash by the end, whereas DmC built up the sense of how they could be brothers but were torn apart by the end and will be clashing like DMC3 Dante and Vergil in the future.
3) I'm interested what Dante imagined when hear "...to rule". Like Vergil resurrect succubus for poisoning people again, then take lash and go to "rule" or something like this. It's whas not for humanity, it was because of bad scenario.
I think what Phineas told Dante about who will take Mundus' place made Dante worried Vergil would be a bad ruler.
There were also hints of Vergil being not quite right which Dante saw. Vergil made Kat erase the servers at risk to her life, let SWAT shoot her, let her be captured, refused to rescuse her from Mundus until Dante argued the trade, then endangered Kat's life by shooting Lilith. Vergil also hid in the shadows while he made his brother do all the dangerous work. So, I guess those would be some good hints to Dante that maybe his brother was not as good intentioned as he seemed.
Kat was human, and he treated her as if she was expendable, so I guess Dante thought that would be Vergil's attitude to humans once he ruled them. Even though Vergil said he would respect his 'subjects', he's almost being like Mundus who said that he was saving the humans from themselves and giving them order. Mundus and Vergil were quite the same by the end.
Then there are the event sof the DLC, Vergil's downfall, which show that behind his calm face, he's a twisted guy...maybe worse than Mundus by the end of the DLC.
4) Original Vergil is non-emotional type of person. And this is good. Because Vergil-moaner looks pathetic. And besides, original ending looks more sad for me even without all that "I loved u T_T"
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I agree, Vergil giving himself a pitty party would have been strange to see. I would not have liked that. At least DMC3 Vergil had some kind of feeling for Dante at the end, feeling enough to tell him to get out before he was trapped in hell.
As for DmC Vergil, I do wonder if his 'I loved you brother' was genuinely loving him like a brother, or loving him because he was the only Nephilim and the only one Vergil saw as good enough to rule with him. Either way, he seemed pretty betrayed and hurt.