It is my understanding;
If Krishna wanted to cap the differences between Pandu and Kaurav, he would have done that but he dos not,  because Arjun is brother in law , he is the great orator full of logic and I will say a great philosopher and a great psephologist who can do any thing he can. Somewhere ( not trying to be bias ) trying to save gop bansi ( Brahmin ) and their greatness. How Krishna was manipulative can be seen in Geeta, where he proved it was him who created and evolve around him. 

A great epic to be read but we have not read the real Mahabharata , who ever writes it have his version .