If I understand you correctly you are asking why would you hold BTC past 25th if it hits ATH before, since many expect it to dump afterwards ? If so I think your thought process of selling beforehand and waiting for bottom of IV is sound and preferable to getting some free BTG. The problem I see is that we do not know if it will hit ATH before 25th so in order to get free BTG we will need to transfer BTC out of Coinbase. The risk here is that transcation times are really long and you cannot sell your BTC quick enough if prices plummets after 25th ? What is the best strategy ?