I think it makes sense, given that they named a Signature model after him, that Alembic did talk to Mark in 1986 about specs for the Signature bass. But Alembic also has a Stanley Clarke Signature bass, and until this past year they had never actually GIVEN him a bass. I would not find it hard to believe that Alembic may have consulted Mark King about a Signature bass specs without actually giving him a bass.
Peace,
James