Nero vs Dante first fight was good. But in the 2nd boss fight, it should've had Nero facing Dante in his devil trigger form. Especially in the cutscene where Nero uses Yamato on Dante. Nero thought it got him, but Dante appears from the smoke and reveals his DT form.
After the false savior fight, Dante should've been the one to fight Nero "if" Vergil possessed Nero.
After the false savior fight, Dante should've been the one to fight Nero "if" Vergil possessed Nero.