Okay, trading pairs are important, but they cannot replace the trading volume data, while the latter can be faked, as the article states. Surely, people who are interested in many altcoins, hate it when they have to maintain activity on bultiple exchanges, because some coins are available on one and others on the other. But as for the top-3 three exchange list you got in result, it shows that trading pairs is not all that matters. I really enjoy Hitbtc, for instance, but Bankor is kind of a minor exchange with volumes that are not enough for serious traders.