  :Your point's 1&2 are valid reasons to include this information in the Purim article.  Regarding the subject of this article, it is a violation of WP:UNDUE.  Regarding item 3, it sounds like, again, FRINGE.  Not that it is a fringe theory about the facts but rather a perspective of a fringe of the Jewish population (the subject of this article) and to put their perspective in this article is to violate WP:UNDUE.  (Additionally, you would need a WP:RS for this.)  Regarding #4, I am not saying that Horowitz is not a legit scholar, rather the view he expresses is a fringe one if not a lone voice.  As such to include it in this article is to violate WP:UNDUE.   