The reason I am harping about delta is bc when the mkt-thingy crashes the short put or whatever is no longer fucking you on vega or gamma, OK? Terminally it's not about your gamma position but your MTM against index... and that's your PNL expressed as your index proxy (your 99D put) because now you're long 1x1 against index. If I could understand gibberish I'd state that you're conflating microstructure during a panic with gamma. If you're short the fcking 10,000 Dec put in NDX and the NDX trades to 7,000 your gamma and vega are not the concern. They are not moving the needle.
Ease down, Ripley, you're starting to show cracks in your armor and are about to just crush the aliens and drive right through the wall and blow your transaxle. You said market-thingy. When ye who are one of the most techincal-typers here start getting to that level of banality, you need to chill, brah! LOL! Thanx for the chuckle!
there are several, one important is to keep the margins carefully under control, with all that goes with it...