1. Having sold your Bitcoin for 20,000, only to wake to find its gone to 100,000 overnight (well , over several days during which time you were unable to get onto any exchange - all crashed)
2.Same scenario except you never owned Bitcoin at 20,000
3. You kept you Bitcoin at 20,000 - it dropped to 15,000 for a few hours before eventually going to 100,000 a few months later
4. You bought Bitcoin at 20,000 and it went to 100,000 a few months later
3+4 make sense - 1+2 do not.