Marx never called himself an anarchist because communism/socialism is already stateless, there's little need for using another term. Especially one used by Proudhon, whom both Stirner and Marx criticized.
Rubel's article is well argued and isn't silly. Plus it takes care not to say that Marx is part of the political current called anarchism. The aim is to present Marx's anti-State views. It's more directed against statists than anarchists. However, Rubel in the post-scriptum of the article chastises anarchists for having the same understanding of Marx's thought as stalinists. The 1983 post-scripum, not the one in the link. See here in French.
I wouldn't defend Bakunin's "philosophy about organisation". He was pretty clear that the individual was to submit mind and body to the revolutionary organization and that he preferred the "invisible dictatorship" of the revolutionaries over the dictatorship of the proletariat. His love of conspiracy type organizing is what got him kicked out of the International (and not just by marxists but by Marx's opponents the proudhonists as well). Not to mention while he was himself an abstentionist, he did encourage one of his friends to run for parliament on the basis that they, contrary to others, were too principled to be corrupted by power (the same weak argument you, rightfully I think, criticize the social-democrats for using). I still like reading him but certainly not for his "philosophy about organisation".
Rubel talks of this in the post-scriptum I linked, Kostas Papaïoannou as well but I think Maurício Tragtenberg's Marx/Bakounine is the best account of their differences (link to a downloadable french translation from the portugese).
Edit: Oh yeah and Marx was anti-State before Stirner, just wanted to point out the influence on his thought.
You criticise Kohn for saying:
Yet you let Pannekoek get away with saying:
That's what I mean by the arguments against Kohn being ad hominem, based not on his well-researched article with citations but on him being a member of the SPGB. I think it is also called double standards.
Pannekoek also claimed, which Kohn didn't, that "the Anarchistic ideal discloses itself here as a petty-bourgeois ideal, a yearning for the "liberty" of the small, independent producer".
As to Stirner, it wasn't Kohn who came up with the claim that Stirner was the pioneer of anarchism. That was the claim made and propagated by some anarchist intellectuals themselves. People here claiming to be experts on the period 1890-1914 are refusing to accept this historical fact. Benjamin Tucker, who published the leading English-language journal of the day, had it translated into English in 1907. That's why A,M. Lewis included him as one of the Ten Blind Leaders of the Blind in his 1910 book, and why Kohn would have taken up the point. In fact, the very fact that Kohn mentioned it is itself confirmation that this was a claim put about by anarchists at the time. After all, as has just been pointed out, Stirmer himself never claimed to be an anarchist. If anarchists didn't claim him as one of their Own why would Kohn have mentioned him?
I don't think the claim that Stirner influenced Marx to become anti-state stands up (not that McLellan claims this un the passage quoted: only that he had some influence in Marx going beyond Feuerbach). Marx had already envisaged a society without a state dominating it in The Jewish Question that he wrote in 1843.
Kohn's article gives a good outline of the different strands of anarchist thinking in the period: individualist, bomb-throwing, syndicalist, etc. He even mentions Malatesta's (probably the best known anarchist of the period) difference of view with the anarchists who had taken over the CGT.
Two passages in Kohn's article have been ignored:
and (the one Red Marriott in particular missed):