With no suspension on some vehicles, very limited on others , and added weight to the rear swing arm on the faster bikes, it would seem that unsprung weight is not the factor that it is in other forms of racing.
The weight to HP formula is used to measure acceleration over relatively short distances and does not apply equally to Bonneville.
Rotating mass, like unlightened cranks , and full weight brake rotating assemblies, are your friend when you resume power in the next gear because it helps to maintain what you already have.
Speed, time, and distances that are part of the Salt setup, are unique to it.
It even helps "Fraction Control" for those that depend on it so.