Why did zcl start its pump dec 25 and this announcement was posted jan 1. Is there another announcement of btcp somewhere?
No. It was insider trading.
Definitely by some friends n family of a serial forker

Is anyone interested in investigating this crime? Some people made millions and millions of dollars in an immoral and illegal way. Such people are a disaster for our crypto community. They enrich themselves and make everyone else poorer and devalue the whole crypto currency system.
If someone has the balls to make an official case out of it, this would truly draw global attention to it. And if I think about it, there might be a good chance that those guys get into deep trouble. The price increase on Dec 25 was clearly insider trading. And if exchanges are forced to provide info, I can imagine that the right blockchain analysis delivers the results a court might be looking for.
You may wanna do a bit more research before starting that 'case'.
This was tweeted on December 14:"I would like to propose revitalizing @ZclassicCoin by migrating it to become a Bitcoin Hardfork, "Bitcoin Private" (or possibly other name).
New coinbase inputs would be airdropped onto the blockchain as a hardfork. What do you think? Should we add "Bitcoin Private" to the mix?"
Source:
https://twitter.com/HeyRhett/status/941197043267186688Additionally, a few days earlier he tweeted about revitalizing Zclassic
https://twitter.com/HeyRhett/status/939300477472333824Finally, the Bitcoin Private team is a totally different team than the Zclassic team. Of all the Bitcoin Private team members (50+), only Rhett was a teammember of Zclassic when he made the tweet on Dec 14.
Let's put it differently: are you sure there is no way he could get into trouble in front of a court these days? I am not so sure about that.