[island911]

Glen said Megapixels alone do not make the sensor good. The pixel density on a full size sensor is not nearly as high as the small sensors. The large sensors just have more area to do the same work.

That was the context.

IOW, if a FF sensor array is doing the same work (capturing the same image) as a smaller sensor array, then it will be further back (lets assume same megapixels and a pin-hole camera from the same physics closet as the massless ropes and frictionless pulleys)

What you are talking about is the advantage of using existing lenses to get a larger image. ..or that you've been dragging around lenses too big for your existing sensor. That's different than saying that a larger pixel works less.