But as a somewhat conservative-minded, advaitin tabra, I tend to believe that Gita was included (some scholarly opinion is that the Gita itself, as also very many verses in it, are later interpolations) mainly to project the Krishna character of Mahabharata, which had been that of just a king who was a relative of the Kurus (by which I refer to both Pandavas and Kauravas) and having a partiality for the Pandavas, and trying to help them in many ways and instances, including some which may not be entirely Dharmic, but, nevertheless, “polished” over and justified by stories of Poorva Janma Karmas, curses and so on and so forth. Without the BG, Krishna of the rest of M. Bh. is a Machiavellian prince of the Yadava clan, and the Vrishni kula or sect. But, once BG got incorporated into the body of M. Bh., Krishna just soared into the heavens, literally!