So you admit that you have absolutely no proof of what you are saying? Thank you for honestly admitting that, at least. I’d ask you to prayerfully read and reflect on the two following passages of the Gospel of John.
St John taught many people well and truly about Christ during his life, yes. But he didn’t expect people to simply believe any old person’s word for it that what he said was true. Instead, he made very clear at the end of his gospel two points:
a) His written evidence (proof, in your words), in the form of the Gospel, was “written so that you may believe” (John 20:31). In other words he knew people would rightly ask for more than empty assertion in regards Christ, and provided a written account of the abundant evidence for Christ’s existence, teachings and divinity.
b) John secondly realised that people couldn’t rightly be expected to just believe because he wrote, even though he wrote truth. So he also makes the point that he was an eyewitness to what he wrote about!
Hence the following passage - ‘This [the disciple Jesus loved, who was there during Jesus’ ministry, at the Cross and the tomb and after the resurrection] is the disciple who testifies to these things and who wrote them down. We know his testimony is true’ - John 21:24.
Since St John didn’t expect his own generation or future generations to believe in Jesus without eyewitness testimony, and so provided it for them, then it isn’t unreasonable to ask for the same in regard the origins of yoga. The events of Christ’s life were, after all, thousands of years ago also. And yet we have been given proof of them nonetheless, in the form of the Gospels, not to mention the rest of the New Testament, also written (or at least dictated) by eyewitnesses (or earwitnesses in the case of St Paul

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It’s not at all asking too much to ask for contemporary eyewitness testimony as proof of your claims about the origins of yoga. It’s only asking for what we’ve been given in regards Christianity.
If they were self-proclaimed offenders and capable of asking for legal aid, then you’d have a point.
But these people aren’t self-proclaimed offenders - if they were you’d quote their own sayings against them to prove it. Of course you can’t, since you don’t even know who they were. That’s the whole point - you’re making completely unfounded assertions about a group of people you don’t even know.
And considering that they’re not around to either defend themselves or ask for legal help, it’s silly to say that I can’t or shouldn’t defend them.
Terri Schiavo, an American woman who was cruelly taken off life support and allowed to die a few years ago, certainly didn’t ask for anyone’s help. She couldn’t. People stepped forward voluntarily to help her and fight for her to be kept alive nonetheless.