That's not what I said in my post. Read it again if you didn't understand it.
Perhaps you're confused by the word "shape". I use it to describe the form of a body, not the physical condition of an athlete.
Also note the word "minimum"...
That is, if they both were powered by a 100% efficient power source, the two outwardly identical riders would use the same amount of fuel.
The difference in energy expended by the two, is all down to relative efficiency levels within the respective bodies. That's impossible to measure using something like a power meter. That meter will only register the minimum power (and thus, energy) required. There's no way for it to measure that the unfit rider burns 10% more energy in total, or whatever the difference might be.