Nanking what if

[CCA]

I was reading the book "The Rape of Nanking" by Iris Chang just the other night and a thought struck me "What if the Chinese ARmy had fought for nanking, I mean there were several ineffective fighting but I mean Chiang Kai Chiek actually decided to stay in the capital along with the Government and decided to fight till the bitter end Berlin or Stalingrad style.
WOuld this have affected the IJA advance?
Would the Rape of Nanking still happen?
Will CHiang emerge a hero assuming he comes out alive?
Would this become the turning point of the SIno-Japanese war?