Note how I use a resized parent to visually "bracket" its composed items. It makes it much easier to read, and makes it easier to manage the composition associations. Better still, consider employing <<composition>> wrapper Components as shown in the next image (not standard SysML).

I don't recommend that you name EverySubsystem the way shown in the spec sample; simply apply the «subsystem» stereotype and display it. Motto: "trust the stereotype"

Image: