It's not even a remotely accurate comparison; 990cc/2 stroke 2002 season vs the 800cc 4-stroke 2007 season. As Arrab pointed out --and you again have completely missed the point-- it was not an evenly matched grid from the perspective of everyone running engines mandated by a set engine formula. If everyone in 2002 was running a 990cc 4-stroke, then your point had weight. Instead --to use an F1 analogy-- it was like Tyrrell Racing running the DFV Cosworth engine in 1984 and for part of 1985 when the entire grid had pretty much switched over to the 1.5 liter V6 turbocharged engines. The little Cossy was putting out about 500BHP when the turbo engines in those years from Renault, Honda, and Ferrari were already north of 700HP in 1984 and north of 800 in 1985. The strongest track for the two strokes in 2002 was at the Sachsenring, a nice technical circuit that allowed for the agility of the 2-strokes to shine. Similarly in F1, the DFV Cosworth in 1984-1985 shone at Monaco and Detroit, both technical street circuits that negated the horsepower advantage of the turbocharged engines due to the turbo lag.