I think the ? means that the statue was invisibly destoyed in 1914 and the kingdom is already a mountain that is beginning to fill the earth...
INVISIBLY!!
That's the rumor that I'll start spreading.
"We know the end of this wicked system must be close because the rock already destroyed the image in 1914!"
It would clear up the entire prophetic mess of the entire book of Daniel to simply say that it is all fulfilled. So we can forget about all the false prophecies of WT regarding the King of the North and King of the South because it's already all fulfilled.
So, all you sheeples just shut-up and get out there and recruit since the end is near because we say so!