User blog comment:Legionwrex/Did the Leviathan DLC really add a new twist to the endings?/@comment-1679409-20120830185146

I've had similar thoughts. As I was playing, I thought, "Here's a potential plot for a new game/series." The Leviathans are clearly not the nicest of creatures. Their attitudes seem only slightly better than those of the Reapers. And, the Leviathans probably mad at Shepard for pulling them into the war.

I think either of the endings could lead to a Leviathan War. Destroy removes the Reapers and their ability to check a Leviathan threat. It removes a potential allied race in the geth. It also leaves the galaxy in the harshest post-war state and also means it'll take longer to rebuild.

Control leaves the following question: in a battle between a human mind (Shepard) and an "apex" creature like a Leviathan for control of a Reaper/the Reapers, who would win?

I don't Synthesis is as "Kumbaya"-ish has you'd think. It seems to me that, while it fosters a better understanding between synthetics and organics, it doesn't necessarily lead to a better understanding between organic races. So, I don't think it'll wipe away the Leviathan's attitudes toward other races. Plus, the idea of mixing Reaper and Leviathan may lead to some dangerous possibilities.