According to Osho, the Gita’s authenticity does not hinge on whether Krishna personally spoke it, but on the Krishna-consciousness that shines through it. Whether voiced by Krishna, written by Vyasa, or another, the Gita is “news of Krishna.” Like the Ganga proving Gangotri, the Gita’s very existence testifies to its source; names are secondary.
It doesn’t matter who said or wrote it—the Gita is real because a Krishna-like wisdom had to be behind it.