Ideally - yes. Practically we need to choose appropriate number of polygons accounting how close camera in a regular game can be.
Also I think baked AO shouldn't be so black as the human skin has significant subsurface scattering. So I'd make it warmer and leave darkening to normal maps.
About normal maps in terms of the engine: they shouldn't contain noise as it's not good for compression quality and might lead to light flickering on our general scale.