I do not know where and from which wallets large amounts of Bitcoin were withdrawn. I just read a discussion of this process. Perhaps this is one of the options that explains the fall of the market.
In principle, this could serve as an explanation, but so far there are no special moves on top wallets.
I think this is a good sign. Since the owners of large amounts of Bitcoin do not sell their assets, it means that the cryptocurrency market will still exist and will grow again in the near future.
I agree with you. If top wallets do not start selling their assets, then they are calm and confident in Bitcoin