Analysis of information sources in references of the Wikipedia article "Charles Cartwright" in English language version.
The evidence suggests that Hardy's contribution was more than nominal
During a run of that piece, <98.9> in the midst of a performance, Mr Cartwright suffered a stroke, from the effects of which he never fully recovered.
[...] the burlesque of Don Giovanni was the production of the time, and in this he gained an engagement, under the assumed name of "Charles Cartwright," which henceforward he resolved to make his own.
[...] it was not until [Cartwright] played Chadband in Jo that people began to have a glimmering of his real worth.
I opened a new theatre, the Gaiety at Bombay and produced 35 pieces, some of them musical pieces, in five months.
Another celebrated English actress, Olga Nethersole, was partnered by Charles Cartwright in a month-long season from 23 May.
Cartwright, Charles M. Captain Vere (279) in Bells of Haslemere, The (28 Jul 1887-8 Jun 1888)
Cartwright, Charles M.
Jephtha Grimwade (207) in Woman's Revenge (1 Jul 1893 - 3 Mar 1894)
Cartwright, Charles M. (Stage directors) 1893
Jephtha Grimwade (207) in Woman's Revenge (1 Jul 1893 - 3 Mar 1894)