Yakushi Kabuto had never been a problem because of his personal strength.
Not at all.
Not even the Yakushi Kabuto of today.
Even if Yakushi Kabuto had fully mastered Sage Mode,
Naruto might have needed to put in a little effort.
But if Naruto truly set his mind to killing Yakushi Kabuto, he could still do it fairly easily. The real problem was the Impure World Reincarnation Jutsu. The powerful warriors summoned directly from the Pure Land might be slightly weaker than they had been at the peak of their lives because of the difficulty of controlling them. Usually, they would retain only seventy or eighty percent of their strength, or even less. But the problem was that there were so many of them!
The Akatsuki already had the One Hundred Thousand White Zetsu that Uchiha Madara had prepared in advance for Obito.
If they also had the Reanimation Army, just like in the original story,
the severity of the situation would only increase.
Naruto wasn't worried about anything else. He was worried about the casualties Snow Ninja Village might suffer in the war. If not for that, he wouldn't bother worrying about the so-called Reanimation Army. As long as their strength didn't reach the level of a Super Kage, he could completely ignore the strength of mere fodder. But no matter how he looked at it, the core problem remained the same: he didn't have to worry about himself, but he couldn't help worrying about his companions and subordinates.
It wouldn't even take many.
If casualties exceeded thirty percent in this war,
Naruto would be heartbroken.
Let alone the fact that
if the Akatsuki truly prepared for an all-out war,
the casualty rates of the major ninja villages might even exceed fifty percent.
The Five Great Shinobi Villages might