Perhaps, but this is a chicken vs. egg situation. Which came first : The drop in the index or the run-up of gamma ?https://www.marketwatch.com/story/t...tock-market-by-the-end-of-the-week-2019-12-18
“This dramatic decline coincided with a spike in market gamma. It is my view that this decline was furthered by forced selling by the put sellers who needed to sell the S&P 500 index to cut their losses.”
Also, the put sellers needed only to cover their positions instead of selling the index. Alternatively they could have sold call options.