I have a theory that some of the market crash in December was because of selling Bitcoin (originally gotten from USDT) for USD in order to fill their reserves o

I have a theory that some of the market crash in December was because of selling Bitcoin (originally gotten from USDT) for USD in order to fill their reserves of backing USD. I think that USDT could be moderately sophisticated in that they could have fulfilled their coffers via market manipulation. If they were smart and brazen, I think they could have possibly pulled it off. One would have to study the market inflows and outflows. This type of pump and dump would show up in their books, so a thorough audit would find it. But it may mean that they have a lot of USD now. Thus I am unsure if USDT will technically crash.