we can see direct evidence of JP Morgan having bought large amounts of Bitcoin

Might there also be a way to see if, just after Dimon's announcement, J.P. Morgan sells a chunk of Bitcoin to trigger the selloff? Demonstrating that would show intent to manipulate the market beyond Dimon"s pretense that he is simply voicing an opinion.

The truth is, that he did the financial equivalent of shouting 'fire' in a crowded theater. He should be prosecuted for causing a panic as a representative of J.P. Morgan.