Apart from the obnoxious title, the only serious objection that I see to Howlett's article is that one needs to determine "the citation standards in 1870 mathematics in Germany regarding these details around Cantor and Dedekind". I think Dedekind's reaction to Cantor publishing his result on algebraic numbers in 1874 without acknowledgment suggests that, in fact, Cantor did not live up to such standards. Namely, Dedekind's reaction seems to be one of shock: he stopped communicating with Cantor for several years, and whenever the correspondence resumed, he made sure to keep copies of whatever letters he sent to Cantor (which he did not do previously).

Cantor saw himself (and only himself) as the Heavens' messenger as far as his set theory is concerned, which is probably how he justified such actions to himself. This does not mean that his actions are justifiable by a more objective standard. The discovery of Dedekind's 1873 letter definitively establishing his priority is clearly an event of major historical significance, and not merely a detail completing an already satisfactory picture.