Coincident? Slumps happen, but not to 60-70% of the team at the same time. There are 9 guys playing more or less regularly and three or four more platooning, etc. Two thirds of them are playing like they have no idea what's going on. That includes Leon who suddenly looks, probably, like he did in 2015. Can't blame it on the road trip. It started long before that. We can look at the 30 day numbers, and see that they are mostly under .200. To think JBJ can bounce back like he did previously may be wishful thinking. Pitchers and pitching coaches aren't stupid. There have a million films from a million different angles, and computer data they may now know how to use.
Several other teams are tanking at the plate also. The strike zone will have to be addressed before too long. Strike are being called on guys on pitches that nearly brushes them off.
So, why are Pdroia and Betts the exception? They both have shown they can hit the high fast ball, and pitchers are not gibing either one of them that pitch very often. So, they are exceptional hitters, and will be content with singles unless the pitcher makes a mistake. Xander will catch on, too. But I wonder about the others.
I go with the bring up Moncada crowd.