I believe only Geller had a plus against Fischer and he would have certainly lost a match to Fischer had they played. Its interesting that both Spassky and Petrosian have 50% scores with Kasparov, 2 players that Fischer demolished in matches.
Doesn't Kramnik have a huge win % on Kasparov in his prime? And didn't Kramnik get waxed by Anand?
Using your logic you could assume that Anand should have a better score vs Kasparov than Kramnik does, but that is flawed and not necessarily true.
The match between Kasparov and Kramnik is "questionable" to say the least ! Kasparov has never lost a game to Shirov who beat Kramnik in a match, Kramnik not winning a single game. Kasparov also beat Anand convincingly in a match yet Anand destroys Kramnik, surely I am not the only one who sees the Kramnik/Kasparov match as highly suspicious ? Another suspicious factor is that Kramnik never gave Kasparov a rematch AND spent the rest of Kasparov's career avoiding Kasparov !
"The consensus is that Capablanca used a computer"
I've always supected as much. Even his name sounds like a computer progam.
So that's why Capablanca was known as 'the chess machine'!