Bhagavad Gita was compiled by Vyasadeva ('Vyasena grathitam') in the anustubh and indrabajra/upendrabajra metres. To convert the conversations into such metres, He surely had to change or add words to maintain the rigid structures of these metres. Why is it then that each and every word captioned 'Sri Bhagavan uvacha' is taken by the great acharya as the utterance of Lord Krishna Himself?
Why are all the Gitas streelingavachaka, i.e none is named as Giah or Gitam?