From the good problem to have department, the Caps have two really good lines at the moment, too good to mess with, really. They have a scoring line of McMichael-Dubois-Wilson that is firing on all cylinders, producing goals and also getting the toughest assignments against the other team's best line five-on-five each night.
They also have a checking/energy line, of Duhaime-Dowd-Raddysh, which has assumed the identity of Dowd's line from last year, and done it seamlessly. They maintain and regain possession and make life pretty miserable for the opponent. Relentless on the puck. Can eat up minutes, if you don't watch it, because they're so effective.
Typically, these are the second and fourth lines. Yet they do so many things that they're more 1b and 3b in terms of ice time and opportunity.
It's left the rest of the team sort of unable to find line chemistry. When the coach wants to make changes to juice a line combo, he's forced to mix and match from his first and third lines. Neither line is doing a ton. Strome plays with Ovechkin and they've had a revolving door of linemates. An island of misfit toys makes up the third line and bench.