I'd go with Obito and Pain. Kamui is broken and Pain is still a powerhouse, even if Nagato isn't in his prime. I think Pain can take care of Deidara and Kakuzu mid diff. Itachi and Shark-Man are more problematic.
well, actually kakuzo survived naruto's rasenshuriken, and after that, was killed by kakashi with a raikiri. and the rasenshuriken is a one-hit ko so... if it weren't for pain, I would say the 4 akatsuki, but with pain, its almost a tie, imo