There are always arguments when it comes to MVP awards. In sports the year's MVP is generally the guy with the most dominant performance, but I've always argued that it should be a guy who is more valuable to his team than any other player is to his own.
In the case of these threads, I just interpret it as: the most deciding factor in the game that week.
FWIW, the Jets postgame picked Marshall for this week's MVP of the game.