Well, FM drove some great races for Sauber, leaping forward during the first lap, passing more cars during the races than most other drivers. Based on this alone and considering the car he was driving back then, according to your logic he would be well ahead of the dominant car driving KR and FA.
Skills commonly translate into measurable successes - name one driver who became world champion without some vital skills to do so. You could argue that the opposite is true as well, there are some highly skilled drivers who never became champions. But they at least showed their brilliance in winning races - again, measurable successes.
Pair these measurable successes with the obvious raw speed (again measurable in fastest laps), driving skills, racing skills, glorious races from way back on the grid, fantastic mastery of rain conditions of MS and you have the greatest driver of all times. Don't like it? Jump back into the roo pouch down under


Remember this? This is what legends are made of. This is what separates the man from the boys like KR and FA.
The outstanding performance of the year did not result in a win. Schumacher drove the final two-thirds of the Spanish Grand Prix at Barcelona with his car stuck in fifth gear, and still managed to finish second behind his great rival, Damon Hill. "For me, it's something like a victory," the German said. It was a stunning achievement.