Shakespeare once said that "a rose by any other name would smell as sweet". Well, all due respect to the Bard, but Sebastian Moran would argue that point. The Boss was not the same man as Jim who was not James who was not Moriarty. The Boss issued orders, made demands, told you exactly where and when and what but never why, and treated you more like a well-trained puppy than any employee. Jim was proper, well-mannered, bieneducado, opened doors for old ladies and carried their groceries up the three flights to their apartment even though it was 30 minutes out of his way; but it really wasn't at all, because what he really wanted was to get into that building without alarming anyone, and how better to do it than as Jim, nice guy extraordinaire? Moriarty was a threat, whispered or written, an idea more than a man, a schemer with a mind like a god, someone a smart person never made angry. He was the organization itself.
And then there was James; James was different. Sebastian, arguably the closest person to him, had only called him James, even mentally, five times.
Draw your own conclusions.