Originally Posted by atwl77

I don't know which calculator @billridesbikes used, but this one that I checked produces similar trends: Cycling Wattage Calculator (omnicalculator.com)

But generally speaking, assuming all other factors being equal (and no drafting involved),
- when two riders are putting out the same POWER, the lighter rider is faster
- when two riders are putting the same W/kg, the heavier rider is faster