Bitcoin is the king of all currency. first of all bitcoin is the number 1 and in fact the only decentralized currency in the whole world. secondly these numbers are market capitalization so when you consider coins like ETH you should omit their premines from the market capitalization. for ETH 72.5% of its current supply is premined so its market cap drops by as much. the same goes for Ripple, all of it is released by a centralized authority and no one knows how much is really in circulation.