Can we draw the following hypothesis from the context?

Context:

Will Vodery (October 8, 1885 - November 18, 1951) was an African-American composer, conductor, orchestrator, and arranger, and one of the few black Americans of his time to make a name for himself as a composer on Broadway, working largely for Florenz Ziegfeld.

Hypothesis: Will Vodery was the only African-American composer working for Florenz Ziegfeld.
It's impossible to say