they are dumping since december but why there was no real drop happening in the past months . miners are also like us and the reason why we sell our coins because we want to profit . they are experts and they believe that the price of btc last time was the highest so they sell what they got and they also sell because like what you said they are investing on another new coin but was that coin not the mimble wimble coin something ? because afaik that was the coin that was introduced on this forum before or they might be a new addition in the team . thats cool though