As for Pannekoek, I don't care what he says. My apologies to his followers, but I really don't think he is a good source regarding the issue of a proletarian party.
Pannekoek - Council Communist
Council Communists - Anarcho Syndicalists/Anarcho-Communists
In the words of Morpheus,
"Far-left Council Communism is a form of anarcho-communism but they don't call themselves anarchists because they usually (a) don't understand anarchism very well, (b) harbor various prejudices & stereotypes about anarchism, © are extremely steeped in the writings of Marx & those who want to interpret Marx as an ultra-leftist while reading relatively little of anarcho-communism, and/or (d) have been calling themselves Marxists for so long they find it difficult to be anything else."
I could not have put it better myself.
But Pannekoek is mos def not a "good source regarding the ... party". In fact, he has numerous articles against the idea of the vanguard and "linking" Bolshevism to the crimes of Stalinism.
Today the Trotskyites have a right to accuse those who once howled along with the wolves. Let them not forget, however, that they had the enormous advantage over us of having a coherent political system capable of replacing Stalinism. They had something to cling to in the midst of their profound distress at seeing the revolution betrayed. They did not "confess," for they knew that their confession would serve neither the party nor socialism.
- Leopold Trepper (Organizer of Soviet spy ring, Red Orchestra)