Personally I don't understand the thesis of acknowledging the price can drop 25%+ to $6k area but not 50%+ to $4k level if there is natural bearish correction.
you don't understand it because you are calling it a "correction" and your percentages are way off the mark.
a drop down to $4k is not only not a correction but also it is a gigantic crash. the size of it is going to be a little less than 70%. so in other words if you even consider $4k you are considering the market to crash (for no reason i should add) hard!
There never needs to be a reason other than excess supply, weak demand, and thin liquidity.
Also, the market crashed 83% in April 2013 before making a new all-time high 6 months later. So obviously the April-July 2013 dip was just a pullback in a larger bull market. So a crash can be a correction.