Why could someone argue that some of Charlie Chaplin's success can be attributed to Granville Redmond, a talented Deaf actor? Redmond taught Chaplin how to increase audience attendance at his movies.
Chaplin used some of Redmond's techniques and even added him to his own films.
Chaplin didn't know how to hire an ASL interpreter until he met Redmond.
Redmond was able to finalize movie deals for Chaplin.

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Explanation:

I don't understand why ASL would be needed for motion pictures where Charlie Chaplin barely spoke.

However, you could argue that Chaplin's immediate success was as a result of Redmond's inflation of the attendance. This allowed his name to become synonymous in households all over the world. Redmond's techniques definitely helped him in some ways, with Charlie Chaplin often being regarded as master of physical comedy. Redmond was also able to finalize the movie deals, which led to screenings in theaters.