Nice Read!
I am exploring the DEX myself the last days. So far, i`m kinda impressed with the speed at least. I deposit some BTS from Poloniex and just mby 20sek later, they arrived and i could work with them immediately. Wow.

But i didnt get the logic, especially with open.ledger, completly yet. The main argument for this markets is, they are decetralized. And as we see with you ETH problem, it is kinda centralized once again. Shouldnt the process be 100% safe cause it is running on a smart contract? And why this cooperation with open.ledger? why not create this token on the Bitshares infastructure? Why open.eth and not bitETH?

But i`m totally willing to dig deeper in this topic. The idea about a totally trustless free exchange is just awesome!