Or they were pumping him for information. BJM didn't recall how he came to be at DR's that day, once he heard the sirens, it may have hit him... and he went to her home on his own, w/his son along jic, since he was a person in the first response field.
Good theory. For now, I'm still going with the theory that the W's tried to set JM & family up with texts, calls and the red pickup truck.