Joseph to John

In Frederick Treves's memoirs, written about Merrick and others, he wrote the name 'Joseph', and then crossed it out and replaced it with 'John'. Having such a close relationship with his patient, I find it strange that he should do this. There are different views why he did it, some say, because he wrote his memoirs many years later he simply FORGOT. However, I believe that would have made more sense had he written 'John' first and corrected it with 'Joseph'. Others say, it's because Treves wanted to give Joseph's family some anonymity. Perhaps that's so. My belief however, is that Treves had the most personal experience and knowledge of Joseph and, he felt by changing the name, he would somehow benefit from keeping the identity to himself. We'll never know Treves' intention for crossing out the proper name and replacing it with a fictitious one. Nevertheless, I'd be really interested to hear your take on this.