But majority who dumps can't be elite traders as they atleast know price will be pumping even more in coming days. So they can't just short their holdings for this types of smaller price dump. May be they will buy more in small dumps.
The majority of the dumpers are either people who secure profits every now and then, or noobs dumping their coins in panic to prevent further losses. Whale traders aren't playing around with 5-10 coins... If you are talking about the real elite of traders, then you are talking about people having tens of thousands of coins for trading purposes, combined with millions in fiat.
Not only that, but they also team up with each other to rule the entire market with iron fist from several major exchanges. If they cash out a certain part of their profits, they know what they are doing. They will either let the market fall back down in order to buy back, as happens all the time when the price goes up nicely, or they keep the market stagnant for a while, where people will dump their coins out of boredom. Either way, dumps are inevitable.