Are you sure about that Theory ? I just think it's movement in/out of older coins into newer generation ones in advance of the WBC
summit next week. NXS is down 17% on Bittrex on low volume (low volume for Bittrex 700+BTC). I don't think each exchange is allocated
a certain number of coins to trade,  that would be wrong. Some exchanges would be up 100% and others down 20%.

When a coin is listed, they usually pay in coins for the listing fee. Binance does this and then takes the coins they received and holds contests
and gives them away for the people trading the most coins.

I think the coin "PURCH" as you describe it is actually an allocated pool of circulating coins that each exchange has access to. One "PURCH". There are
no market makers here, no broker-dealers, only YOU and the exchange. This way the only way manipulation can occur is on smaller exchanges
with very low volume, for example Craptopia. Craptopia used to be a money maker in Jan/Feb, then the scum bag groups moved in with their
pump and dump scams and ripped everyone off. This "group" manipulation cannot occur on Binance.  On Binance, you very rarely see a coin up over 20%
just like the stock market because their is so much liquidty on Binance.