@Breeze - the marine industry in the Caribbean and several academic studies there and in the USA have failed to come close to a commercial composting method for Sargassum. Your post, particularly the first paragraph, indicates that they are all wrong.

I think that perhaps you might be equating what you know from New England to the Caribbean and if you do have a real solution to composting Sargassum that others don't you'll have a real money-maker and be a savior to the local fishing and tourism industries.