I hate to have go admit it but I think Kakashi is dead but not because of so called proof on other threads but just because it adds up.
I went back over and reread it with hope that I could find something to grasp on and found that the only hope was where Katsuyu is on him.
when I saw just how Tsunade reacted to him AFTER Katsuyu was on him. She was in sheer shock over discovering something. To the point that she got up to break her concentration to walk away and hit something out of anger.
Perhaps because she couldn't heal him because it was too late. She clenched her fist in anger.
This is too convincing along with the fact that Kishi wrote The Final Scene on chapter 425.
And really Kishi went out of his way to make it look final as a toast and farewell to a great character by way of him sacrificing himself in such a noble act of saving Choji. But more than that, he saved not only Choji but helped Naruto and thus everyone by getting that information back to Tsunade and through Katsuyu, it gets forwarded to Naruto when he arrives.
But I am hoping that if he is indeed really dead that perhaps if Choji gets there in time there maybe a window of opportunity to REVIVE him.
Let's find out just how many at this point in time are in accord in his death as certain, or alive, or dead with hope to revival, and lastly, just how many are undecided.