This discussion reminds me of the erosion of the Sphinx: Was it water or was it wind?
Now it is: Was it water or was it bat shit?
I’m open for a discussion about whether it is bat shit or not, but I don’t believe it is bat shit. As shown in the picture, the white markings can also be seen on the floor and are all over the place. These markings can also be created by water and it very much looks like that.
Sure bats can do a lot of shitting and probably create the same markings but it depends on what you want to believe.
At the end of the King’s Chamber passageway, where it meets the Grand Gallery, there’s a V-shaped block. This also supports the idea of water running through the pyramid. If water was coming out of the King’s Chamber shaft it would also have reached this V-shaped-block by running through the passageway.
About the researchers you mention, who have never mentioned the white marks: There are so many details overlooked by researchers. People who believe in the tomb-theory will never come to conclusions that don’t fit in their theory.
Who has ever questioned the age of the Sphinx before 1993? Same story.