I am sure people realize that this is not the character that was written into the movie. However Joe and Jack have the same last name , close to the same age , and yes Joe had a sweetheart already , but who is to say he did not find a new true love on the Titanic. And what is wrong if some people honor a dead man that died on the from the Titanic? Does it hurt anyone? It gives the living some pleasure a sweet innocent pleasure , much better than someone texting dik pics to strangers like 2day.