Acting cocky and mouthing off does not make him identical to Dante in terms of personality. That really makes no sense: if I were to do an impression of yo. Nero is far more serious, and more emotional. He doesn't seem to appreciate people joking with him either, while Dante would probably roll with it somehow and create some nice banter. Aside from that, Nero is straight to the point, and he doesn't even really toy with enemies. Maybe once and that's enough.
Like I said, he's like a combination of Dante and Vergil. That is in no way identical to DMC4 Dante.
And all that is just based on a slight impression of Nero. If he is fleshed out more in DMC5, there'd no doubt there'd be even more things to make him contrast with Dante. The two, while they are alike because obviously they're family, are not identical, nor is Nero a knockoff of Dante just because he also likes to crack wise.
Now, back to the topic, I'd hope.