It's just a matter of timing, and not being greedy with hits. He can't heal himself like in 3 so you'll be grand. Take it slow, if he's blocking try and jump around him and helm break his back. But don't try to hit him unless you know you can and get away, when he's charging for a fireball then try. Not sure about ifrit for fighting him.
Dante must die mode is another story.
need to add more moves in the 2nd sig..dante almost seems better..