I was at The Connecticut Sea Music Symposium when Gibb presented his paper..and it was much Better than the video... because we were Not subjected to weird video or audio "Twitches"!!
You could follow everything he did and said, particularly when demonstrating the rhythms using the African bell, etc..

As to Time Signatures used by the various collectors or editors of the Chanteys in the past, that was also a very interesting aspect of the paper.
I would stress that, IMO, Gibb's main focus was on a Chantey used as a work song.....Not to how many sing them today; making particular reference to the Windlass and how 'Shenandoah" was sung while using it in the days of sail (and on The Morgan Whaling ship.)
It was also interesting that the Most accurate notations were made by the Earliest editors....Those who actually had Experience aboard ship!!

Tim Radford