Comment on BTST/ATST( Buy/Acquire Today Sell tomorrow)
Yes, the risk is reduced to almost 0 if selling on T+2 day. The only issue could be when on the auction day, instead of getting stocks, you are settled in cash.(This is possible when exchanges don’t get stock in auction). So now you have cash instead of stocks, and if you have to deliver, you are still short. But this happens very very rarely.