Did the Filmmakers take a Short-Cut in Telling this Story?

Rating: Null/10 (20 December 2018)

This film has some entertaining moments. It touched upon some important points, and the overall tone is fairly light. The production design and music are both outstanding in this film.
Here's what is disappointing: it seems that the Director and writers did not do due dilligence to make sure it would be a fairly accurate representation of Don Shirley. Recently, there have been complaints issued by several members of Shirley's family. They were not contacted for their contribution or their approval. Because Shirley was a private man, there are certain unknowns about his relationships. To go further, there seems to be strikingly different views on the relationship between Don Shirley and Tony "Lip" --- was their bond of friendship genuine, as the film presents? Or did this film take measures to pump-up-the-volume, to serve it's own interests? Others viewers might ask: why would a director or writer proceed with a project without making sincere efforts to communicate with surviving members of Shirley's family?
Lovely cast, although Mortensen (an outstanding actor) gave a over-the-top (sometimes cartoonish) delivery of a Bronx tough-guy with a soft heart. Mahershala (another very apt actor) was fully committed, but after seeing an online video of the "REAL Don Shirley", I have to wonder if Ali researched the persona of Shirley. The actor recently offered an apology to Shirley's family members, but if this project had been vetted out, some of these mishaps could have been avoided.