You think that headline is crazy. Well, let me parse it for you carefully. While actually playing, Jake Marisnick on the field is the Most Valuable Astro. So far this year, he has contributed more wins while in the game than any other Astro in an equivalent time period.
Jake Marisnick has exactly 1.0 fWAR in 73 plate appearances. That comes to .0136 wins added to the team above that contributed by a hypothetical replacement player per plate appearance. The next most valuable player, George Springer, has 2.6 fWAR in 200 plate appearances. That comes to .013 fWAR per plate appearance.