Conversation so far:
what happened with dan dierdorf in 1974?
During his peak years from 1974 to 1978, Dierdorf was regarded as one of the best offensive lineman in the NFL.
Are there any other interesting aspects about this article?
From 1974 to 1976, Dierdorf started every game at right tackle for the Cardinals during a three-year span.
what did he do after the three years?
Dierdorf did not allow a sack during the entire 1976 and 1977 seasons.
what did he do after the 1977 season?
His streak ended in the first game of the 1978 season when Chicago Bears defensive end Tommy Hart tallied two sacks against Dierdorf.
did he retire?
CANNOTANSWER.
what was his biggest game?
He was named as the NFC choice for the NFLPA/Coca-Cola Offensive Lineman of the Year Award three straight years (1976-78.
what did he do after those three years?
CANNOTANSWER.

Question: what was his most important attribute?
Self-contained rewrite: what was Dan Dierdorf's most important attribute?