Was the 1930 gangster movie 'Little Caesar' based on Al Capone, Buggsy Goldstein or Salvatore Cardinella?

The film's title character was based, in part, after the character of real-life, ruthless gangster Al Capone - a vain and cruelly vicious Italian mobster who experienced a similar rise and fall. [Little Caesar also resembled Brooklyn underworld gangster Buggsy Goldstein.] The character of Diamond Pete Montana (played by Ralph Ince) was modeled on Big Jim Colosimo (a Capone murder victim in 1920) - "King of the Pimps" and "Father of the Chicago Mob," and the "Big Boy" kingpin (played by Sidney Blackmer) was based upon corrupt politician and Chicago mayor Big Bill Thompson.

http://www.filmsite.org/littc.html

The movie was adapted by Francis Edward Faragoh, Robert N. Lee, Robert Lord and Darryl F. Zanuck (uncredited) from the novel by William R. Burnett. It was directed by Mervyn LeRoy.

https://en.wikipedia.org/wiki/Little_Caesar_(film)

In Chicago he [William Burnett] found a job as a night clerk in a seedy hotel. Suddenly Burnett found himself associating with a cornucopia of characters straight from the mean streets: prize fighters, hoodlums, hustlers, and hobos. They inspired Little Caesar (novel 1929, film 1931) — its overnight success landed him a job as a Hollywood screenwriter. Little Caesar became a classic movie, produced by First National Pictures (Warner Brothers) and starring the then-unknown Edward G. Robinson. The Al Capone theme was one he returned to in 1932 with Scarface.

https://en.wikipedia.org/wiki/William_R._Burnett

The character of Cesare Enrico Bandello is not, as widely believed, based on Al Capone. Instead, he is based on Salvatore "Sam" Cardinella, a violent Chicago gangster who operated in the early years of Prohibition.

http://www.imdb.com/title/tt0021079/trivia