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@win "Dani unfair weight advantage"
They're Rossi fans. Rossi is only happy with unfair advantages if he has them exclusively.
The argument is that the bike will accelerate quicker because (due to basic Newtonian physics) Force = Mass times acceleration. If force is constant, and mass varies, acceleration will be greater for lower mass.
The argument is flawed for the open (MotoGP) racing class however. MotoGP bikes take considerable strength to ride. Being much smaller is an advantage for acceleration, but a disadvantage for changing the bike's direction. There is less mass to hang off the side, so cornering is a disadvantage. Overall, it is probably a disadvantage to be under 55 Kgs, or over 65 Kgs. Pedrosa should add some upp body mass, and Rossi should get off the pizza. That way, it would even out.
It is a valid argument in the smallest class, because the power is much lower, so strength is not required. That's why they have a combined rider / bike weight limit in Moto3.