Why you shouldn't trust screenshots 100% of the time:
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I'm not saying I know for certain that RichGang did this, I'm just saying it's possible. He does seem to have an agenda, you know. For all I know, it's possible that Dean really did say this - in that case, consider this a PSA. Take "evidence" like this with a grain of salt.
I was sent different screenshots of the same chat by a few different people. I have no doubt that they are legit.