Houston , we have a problem. Seems possible that Tether just got a huge investment or back up, or it is just that they are not fully covered with a 1-1 ratio in dollars as they would like us to believe. Using Occam Razor, it is most probably the second situation, as we did not have any endorsement lately regarding Tether.
The problem is, if they are found guilty of using massive amounts of coins without the proper cover, we will have a considerable drop for Bitcoin and maybe all the other coins, possibly even a bigger movement that the one implied by China ban.
Be careful with your Tether!