Can we draw the following hypothesis from the context? 

Context:

Scarlet Days is a 1919 American silent western film produced and directed by D. W. Griffith and released through Paramount/Artcraft Pictures, Artcraft being an affiliate of Paramount. Richard Barthelmess stars in a role for which Griffith had screentested Rudolph Valentino. It is considered by many to be one of Griffith's worst films.

Hypothesis: Rudolph Valentino and D. W. Griffith knew each other