Ugh....how could I forget Sasori...still sticking with my Uchiha Itachi vote though...to be responsible for wiping out your entire clan and forcing his younger brother down a path of hate just so he can gain enough power to stop Obito/Madara later (if he survives it all) also can't forget the...
Don't get me wrong...Itachi and Nagato are also Godly...but I think brains always out smarts brawn...so Itachi and minato have superior brains and they are they ultimate team...only team better would be Hashirama and Madara
Minato and Itachi are the 2 brightest and most skilled shinobi...you can pair either shinobi with any other shinobi and the team would be pretty damn powerful...both of the on the same team...they are Gods!!!
Remember this is only the 2nd day of the war in the Narutoverse timeline so in all actuality Kakashi has only been trapped in that dimension for only a matter of minutes...seriously like 5 mins tops!!!
A lot of his Justus require "air dashing" the "lotus" technique for example...he doesn't rely on gravity to bring his victim hurdling to the ground, he pushes off air to race in a tornado like fashion towards the earth
As for the Jinchuurikki, their bijuu training would help with the soul tug o war...as Naruto proved when he and Bee encountered Edo-Nagato and Edo-Itachi
I concur...also, we have seen many times people survive some of the "life-ending" jutsu...Might Guy and Rock Lee for instance with the "8 Inner Gates" technique.