The jacks can be 'daisy-chained' and controlled as a synchronised set.

The Laplander beholds the far-off Sun Dart his slant beam on unobeying snows, […]

OTOH, Jam is pretty damn incredible too. You can do some really insane combos with her, especially after using the d,d + attack powerups. And her Destroy move is easily comboable because it has so little startup.

On the Discovery of an Ancient Ironmine in Cliviger, and Some Further Remarks on the Remains of Old Bloomaries in the Neighbourhood of Todmorden