I agree with your assessment of the danger of al Fuqra, but lack of clear identification with a known terrorist group has become the escape hatch for the FBI, the media, and everyone else that wants to hide their head in the sand of political correctness, and ignore NOI and the various violent splinter groups spawned by it.
Muhammad does not need to be a card-carrying member of any group to get his message out: it's there, loud and clear.
And remember, al Fuqra, unbelievably, hasn't even been classified as a terrorist group by the DOJ as yet -- so if they do find a connection, they can still issue the standard mantra of "no known connection to a terrorist group."