We should all know by now that history can be manipulated by any agenda; and sometimes we don't have to wait for it to have occurred before our births.
So, you seem to be arguing that if a story is mentioned a lot on the Internet, it somehow becomes fact.
Objective reality determined by majority vote. OK, I've heard it all now...
It may be likely that the speech giver themself would have the speech written down or recorded. The best reference would be a document or reference to a document that indicates they either had in their possession or had read the written speech. I do not believe that exists either, but am not familiar with the bibliography of the referenced book. One thing seems certain, Ellis wrote serious non-fiction later in his life and this was a product of it.
So, in the end, this particular speech, and perhaps many more, become a matter of specualtion and belief. The arguement should be couched in those terms rather than the unforgiving, absolute terms that some seem to want to couch it in IMHO.
I for one believe that is would be like Crockett to do this and believe he could have said it. Did he actually say it? Can;t say and don;t know.
Regards.
That wasn't so hard now, was it? ;-P