So steem-engine and hive-engine will be 2 seperate 2nd layer solutions?

If steem-engine functions outside of steem, why not just add a hive pegged token and rename steem-engine to a neutral name and maintain everything that's existing on one side chain with a login from either steem or hive?

I mean, it's not like other exchanges are creating an entire second exchange just for hive.... Right? Isn't that the goal of steem-engine, to be a fully functioning 0x or whatever they are called?