For those who remember the 2010 redistricting, MA04 was drawn for Barney Frank, at the expense of John Olver, when Massachusetts lost a seat in the 2011 reapportionment. I can’t imagine the legislature will see the survival of Jake Auchincloss as a priority, and given the peculiar shape of the districts south and west of Boston, there are opportunities for more compact, rational districts.
Three districts have new hometowns for the representatives – MA05, Markey (Malden) to Clark (Melrose); MA07 Capuano (Somerville) to Pressley (Boston), and MA04 Frank (Brookline) to Kennedy and Auchincloss (Newton).
In any case, old rules don’t apply, and I am sure there are friends of the legislative redistricting committee who have more influence over the process than Jake. Break out your cartographic scalpels and have some fun!