NatF
Bionic Poster
Kafelnikov could hit winners on clay with flat shots (without even needing topspin like most clay courters), Hewitt didn't have the power to hit through players on slow surfaces. Kafelnikov was more aggressive than Hewitt and his groundstrokes had a lot more power than Hewitt. He also had better down the line shots than Hewitt. The only disappointing thing about Kafelnikov was his average serve for a tall man, and that he had bad endurance, he would get tired in 5 set matches, he didn't train much and played doubles every tournament.
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Two videos don't really prove anything, I could easily find matches of Hewitt where's he's hitting winners all over the place - yes even on clay (Davis Cup against Costa in 2000 and Kuerten in 2001, Nadal Hamburg etc...). Even in the match you posted Hewitt only had four less winners + forced errors than Gaudio. No way did Kafelnikov have a lot more power than Hewitt either BTW, pretty much any pro can crank it up and it's not like Kafelnikov was a massive flat hitter like Soderling or a guy like Wawrinka who hit with tons of spin as you said yourself. Not hugely familar enough with Kafelnikov to say whether he was better going line but Hewitt certainly didn't struggle there, I'd be surprised if he was as good going inside out or inside in as Hewitt's footwork was better.