The World Series can often be determined by a player who simply takes control and becomes the catalyst for victory. Just think David Ortiz in 2013 when Papi went on a path of destruction similar to a Category Five hurricane. Then there is the possibility of a manager having a hot hand and so far that is the Boston Red Sox with Alex Cora.
Cora was familiar with both the Yankees and the Astros since New York you play 19 times and Cora was the Astros bench coach in 2017 as they marched to a World Series title.