EDIT: I agree with your conclusion, but...

(Checks Don Loeb reference.)

While, unsurprisingly, we end up adding to the same normality, I would not say that these folks have the same metaethics I do. Certainly Greene's paper title "The Terrible, Horrible, No Good, Very Bad Truth About Morality" was enough to tell me that he probably didn't have exactly the same metaethics and interpretation I did. I would not feel at all comfortable describing myself as a "moral irrealist" on the basis of what I've seen so far.

Drescher one-boxes on Newcomb's Problem, but doesn't seem to have invented quite the same decision theory I have.

I don't think Nick ever claimed to have invented the Simulation Argument - he would probably be quite willing to credit Moravec.

On many other things, I have tried to use standard terminology where I actually agree with standard theories, and provide a reference or two. Where I am knowingly being just a messenger, I do usually try to convey that. But you may be reading too much into certain similarities that also have important points of difference or further development.

EDIT2: I occasionally notice the problem you point to, and write a blog post telling people to read more textbooks. Probably this is not enough. I'll try to reach a higher standard in any canonicalized versions.