I understand what your saying but it's based on a true story. Without Shaw, you don't have much of a story beyond black soldiers getting to fight in the Civil War. Shaw's story is integral to the creation of the 54th. So could you do a movie on the 54th Massachusetts and not focus on Shaw, sure probably. However I think it would do an injustice to his story as much as the black soldiers.
I like Glory quite a bit, but it is annoying to have another movie about an important event in black history starring a white guy (or, in this case, two of them).
I am a child of the universe. I will walk gently and true
Of course I'm a creationist. I believe man created god.