Something just occurred to me while reading this thread. What if Echo were programmed to believe that she actually was a Slayer? We know that the human body is capable of performing to a far higher degree than is considered normal. A 100 pound, 5 foot tall mother, under the right circumstances, can, and actually has lifted a car off of her injured child. and people have under special circumstances, exhibited speed and endurance bordering on what could arguably be called superhuman. What if Echo were somehow programmed so that she could tap into those potentials at will, making her the equal, of very nealy the equal, of an actual Slayer. Then in addition, she could be programmed with fighting skills, both mundane and exotic, that would make Neo look like a second lesson white belt.
Given those circumstances, coupled with the fact that Faith, believing that she faced a normal, if highly skilled, human, might in the first critical moments of the fight, underestimate and be taken totally by surprise. If Echo could act quickly and decisively enough, she just might actually have a chance of pulling off a total upset.
