This is a really good post. This team needs a leader and it's not going to be Pedroia. IMHO the team fractured with "It's not me, it's them". That's when the players learned that Pedroia, the heir-apparent to team leadership when Papi retired, didn't have their backs. When they tried to have his back he threw them under the bus and it created a lasting cancer in the clubhouse.
What goes on in locker rooms is usually a well-kept secret so one person't opinion of what happens there is every bit as good as another person's. I believe that the 2017 team won 93 games with individual talent but at the end of the day they weren't playing as a team. They lacked the leadership to behave as a unit.
This team is crying for a leader but I don't see anyone there who has the personality to do the job. The two who should be doing it are Hanley and Pedroia but Pedey is too wrapped up in his own performance and Hanley is too busy preening for the TV cameras and everyone else either is too young (Beni, Vaz, Devers) or doesn't appear to have the personality to do the job (JBJ, Mookie). Maybe that's what DD sees in JDM and that's why he's holding out to get him. I dunno. But I'm confident that this team lacks on-field leadership and until/unless someone steps up that will continue to be a problem.
But then again, I could be wrong.