Some MAG stats from Jeff Thomson, Gymnastics Canada:
The highest Execution (B) Score by any athlete at the Beijing Olympics was Kyle Shewfelt on Vault with a
9.79.75.

Those were Kyle’s 3rd Olympics.
If the Olympic Games were judged only on Execution …
Average B scores were:
1) China 9.12
2) Japan 9.03
3) Germany 9.03
4) Canada 9.01
UPDATE: Those statistics from the preliminary Team competition.
One commenter points out that Marian Dragalescu got a B score of 9.8 on his first vault in event finals. But — just like in 2004 — he missed his second vault. So his combined final B-score was lower than 9.75.
