== A problem with the pen name section == 

 The last sentence in the "pen names" section leaves out the fact that Twain himself has specifically responded to and disputed the reported claim (this is according to the sources employed to make the claim.)  By leaving off the fact that Twain has responded, support is given to the claim by implying that there is either no argument against it or that there is no argument worth mentioning, which is false.  That sentence also by omission misrepresents the footnote.  I think it's weaselly to write that way.  And on top of that to block editors, like myself, from correcting, and at least adding something that better reflects the citation seems like it's not a helpful editorial policy  not in the right way.  And also it seems dubious to have an item like that that claims to come from "bar talk".  That's not good balance. The fact is, we can't know what went on in Twain's mind, not unless we have his words.  And we do have his words so why ignore them?