Exactly. Dan should've encountered Tsunade atleast.
But no! Everybody, kages, five star ninja, every edo left alive had to be taken by Naruto "I can take on everyone and even though I've lost all my nine tailed chakra countless times, but keep getting it back on through all these amazing plot activations" Uzumaki. Him and his Shadow Clone Spam move hyped up with his OP Kyuubi Mode or Sage Mode, I don't know anymore, wiped out everyone. This war's a joke.
The 5 members of Akatsuki alone should be able to kill off atleast 2-3 main characters, but they get killed off by fodder ninja. The white Zetsus should kill off atleast 1 main/support character considering there's 1000000 or so of them. The revived Kages took NO ONE out. Hell, even the great Madara Uchiha only injured Onoki who "WAIT FOR IT" was healed about 3 mins later. It's sad.
Don't even get me started on the Swordman, The most FEARED ninja alive were beaten off screen. Mangetsu mastered ALL swords and we say nothing of his power. All we saw was Kakashi take out Zabuza and the fat guy (just him sealing him). It's pathetic.