Na. Plan was to have V ingratiate himself with Dante and the Gang while his demon half in the form of Urizen the big bad starts doing evil demon shit and sucking up a bunch of power in the form of human blood and souls. Then have the two halves merge back, Vergil finally, hopefully, being strong enough to take down Dante ONCE AND FOR ALL *cue villain laughter*. Works great, but then Dante gets the bright idea to use the sword he inherited from his old man to do the opposite and merge his demon and human halves even closer together, allowing him to draw on a lot more of his own demonic power.
And then Nero somehow manages to go full DT despite having his demonic powers ripped away along with his arm, so things go from bad to worse for Vergil.