Because back in 1974, Linda never explicitly said Bruce had created the Kung Fu TV series. But in the movie Dragon: The Bruce Lee Story (1993) there is a scene where Bruce Lee (Jason Scott Lee) is shown coming up with the ideas for the Kung Fu TV series together with Bill Krieger (Robert Wagner) as they discuss the show while walking.
Around the time the movie was made, Linda Lee was doing a lot of interviews, some of which she explicitly says Bruce came up the idea for the Kung Fu TV series.
What I'm still not too sure about is whether Bruce had come up with the same idea separately, or if Linda really believes the idea for the show was originally Bruce's. In other words, whether 'The Warrior' is actually a separate but parallel idea to Ed Spielman's, or if Linda is claiming 'Kung Fu' is what 'The Warrior' turned in to.