No idea, but I do know someone could have a crazy hot month that doesn’t line up either the rest of their season.
For example, that stretch you highlighted, Duran wasn’t the 15th best player in MLB; he was tied for the 11th best with a handful of players. Some elite talents (Freddie Freeman, Junior Caminero), some rising stars (Andy Pages, Otto Lopez, Dillon Dingler) and some less impressive names (JJ Bleday, Brayan Rocchio). A wide spread.
So you ask can someone lose it in 26 days, and the response is “did he even really have it this year?”