It has the reserves of engine power, but not a full separation of fuel and control systems. For human spaceflight they want to see a backup system that is dissimilar and disconnected from the failing system. So launch abort is a different rocket than that lifting the craft. For chutes, that's an extra chute stored in a different box. For propulsive landing, that would need to be separate rockets using separate fuel tanks controlled by a separate control system. Chutes will be lighter/cheaper.