Any contributor can remove, add, or change elements of the article based on any of Wikipedia's many rules, or just because they want to, like Ken and the climate-change stuff. There's healthy back-and-forth amongst the contributors in the "Talk" pages, documented on the "revision history" page. Each Wikipedia article has both: a "Talk" page is where contributors discuss what should and should not be in the article, and "revision history" gives a timeline of edits to the page. Ken may have made the most edits to the Hurricane Sandy page, but he's not a "lead editor" in the sense that he's the point person for the article, able to decide single-handedly what goes into the piece. There's nobody, really, who does that, though there are a staff of just under 1,500 "administrators" on Wikipedia--also unpaid volunteers, selected by, essentially, a survey of other Wikipedia volunteers--who have a bit more power. One of those admins put the Hurricane Sandy page under, says Jay, a semi-lock: only registered Wikipedia editors who have participated in the community before, not anonymous new folks, can edit it now. But Ken did contribute much more than any other editor--he was the most active editor, though that didn't give him any added authority. It also doesn't necessarily mean he wrote most of the article, though he certainly wrote much of it. An edit is an edit, whether it's removing a comma splice or writing 2,000 words.