By radical shopkeeper politics I mean that Malcolm X's political economic vision never clearly broke from the development of black business as the principal task. That's how it stands in the Autobiography and there is no clear analysis by him of the limits of such a strategy. It is almost impossible to figure out the details or meaning of Malcolm X's critique of capitalism. As you said, he was becoming receptive to socialist ideas; he never developed them in detail.
Because of that Breitman and the SWP could claim Malcolm as one of their own. But it does not seem to me that speeches bear this out; it's just not possible to guess where his mix of islamic, anti colonial, pan african, socialist, etc ideology would have taken him. I think Breitman erases the confusion here in order to mobilize the myth of Malcolm X as socialist to build the SWP.
He supported anti colonial revolts without any analysis of the nature of the national liberation movements themselves. Again I consider this less nuanced than Fanon's chapter in Wretched of the Earth, though people usually don't get much past Fanon's justification of violence in the previous chapters.
For me Malcolm X's greatest importance was his bold attack on the March of Washington as a spectacle that would only do good for the image of the US abroad. He was vindicated a few weeks later when a black church was bombed in Birmingham. But for the limits of the March on Washington and in particular the way John Lewis' speech was censored--with ML King's encouragement--I find Foreman's autobiography (The Making of Black Revolutionaries) more illuminating than Malcolm X.
It is important for me at this point to underline how dangerous and reactionary the NOI is. It does not serve my purpose to discuss whether Farakhan is a fascist, so I will not defend the point.
By the way, I don't think the evidence of FBI involvement in his assasination is strong. Well certainly not as strong as the evidence of the NOI's and Farakhan's involvement. I wonder how Malcolm X would have characterized the handsome calypso singer turned numerological demagogue. See Michael Friedly The Assasination of Malcolm X.
Rakesh