[Atmos (Colin)]

The answer to that in short is no, it would not make any difference at all. Going from a 14-bit ADC to a 16-bit ADC does nothing but change the gain setting.

Just as I described a few posts back that there is some error introduced (about 0.05%) going from 60k electrons to 16k ADU bits to 65k ADU. That same amount of error is caused with a 16-bit ADC with a camera with 12.5 bits of dynamic range. Because there is a lot more values in the file than there is coming off the sensor it just gets spreads out more but the error is still there.

In short, having more bits doesn’t mean it has more dynamic range when the bits are only being spread out in a less precise manor.

EDIT:
How about I put it this way. With a 14-bit ADC you end up with values in blocks of 4; 220,224,228,232... ect.
This creates a blocky kind of error.

With a 16-bit ADC you end up with a smooth profile with more random error. This means you’ll end up more discreet values (not blocks of 4) BUT each value has more error. Both images would have the same absolute dynamic range but the 2-bits of error is displayed in two different ways.
The 14-bit ADC blocky where as the 16-bit ADC would be randomised. Both of which are average stacked out which is the point of stacking.