Yeah Itachi is definetely not finished. If he is the show went from awesome to absolute shit. Oh and main as well say right off the bat that Sasuke is the strongest in the show (if he killed Itachi). Oro killed in like 2 chapters, Itachi in one. It would just be ridiculous.

I think it's more likely and obvious that Itachi isn't finished. He is a genius and probably knew Sasuke would adapt to their previous and therefore adapted to that. Hopefully we get to hear Sasuke's question and Itachi's answer though, and hopefully some explanation from Itachi.