1) At the symposium there was only one scientist who had published we knew not how many articles. We knew exactly how many articles the others had published.
2) At the symposium there was only one scientist who had published we did not know how many articles. We knew exactly how many articles the others had published.
3) At the symposium there was only one scientist who had published a number of articles but we didn't know how many. We knew exactly how many articles the others had published.
4) 1) At the symposium there was only one scientist who we didn't know how many articles he had published. We knew exactly how many articles the others had published.
Which of the above sentences are grammatically correct?
Don't '1' and '2' imply that he had published a great number of articles?