Many of the coins, including many from the top are down like 99% from high. All coins are available at heavy discounts (with the exception of Bitcoin). Whales can come any time when they start see not much drop from here.
Why bitcoin is the exception.
I don't think there is exception for bitcoin.
All have dropped deeply enough to say that they have mostly found their bottoms.
From their bottoms, they will bounce back and recover.
Recoveries after terrible woundly falls take time, and recoveries will not finished after several days or weeks. I believe it will take months.