It's smarter to sell such a large position in small portions for a better return instead of one instant sell-off.
If xrp is trading at 20 cents and total xrp bids for 1.5 million xrp is not reach until 15 cents, that means dumping on market will net you an average of anywhere between 15-18 cents (most likely on the lower end) per xrp.
It would have been much smarter to sell a portion of your xrp sporadically around 19-20 cents, wait for buy orders to pop up in that range again, sell, rinse and repeat..netting you a higher sell average per xrp.
I can understand people who market dump small positions, but this large amount all at once? Stupidity , panic, or Jed...take your pick.