:The first sentence, the "(X name) is a (occupation)", should be limited to the occupation that made the man notable in the first place. It is not enough to say that a man was trialed for piracy, his pirat activities should be the man reason why did does history keeps track of him. Blackbeard is a good example of a man who can be described as a pirate in the first sentence. Further information may be added in later sentences, making overviews of the things written in the body of the article.  
 :As a whole, the lead section should be able to stand alone as a mini-article. It currently says that Jewett was a pirate who played a notable role in the history of the sovereignty dispute between Great Britain and Argentina, by seizing the Malvinas for Argentina. Which is misleading: written that way, the reader may understand that he seized the islands in an act of piracy, when it actually happens that the piracy issue is caused by other activities unrelated to that one. And it is a word that labels because it is seen as negative information by the reader and casts doubt on the legitimacy of the actions told immediately afterwards (see Ad hominem). Consider for example Thomas Jefferson. What if the opening sentence was "Thomas Jefferson, owner of 600 slaves, was an American Founding Father, the principal author of the Declaration of Independence and the third President of the United States." 
 :As for Henry Morgan, I find it disturbing: there was a discussion days ago about adding or removing that term, and you maintained the opposite idea: you wanted to remove it. You could not do it... and now you move to another article to apply the consensus achieved somewhere else on an unrelated discussion. Have a care, that's basically the main definition of WP:POINT