As previously mentioned in other video for non Challenge mode clear, extra stats meant Ela needed more crits procs and Exu2 needed more aoe blast while time limit on Lemuen was even tighter (boss looping around and killing her and enemies spawning on second phase that will kill her). So here it's a mix of ammo only completion as well as researching which mechanics can be abused. You can't repeat coffin strat as in my other video so captured operators are locked, but turrets don't perceive soaring operators so could be potentially abused.