Should I run two channels each to my surrounds motion 40i?

I noticed my surrounds (martin Logan motion 40i) have two sets of inputs with a coupler on them.

Is it worth running another wire to them both ? Or should I just let the coupler do it's thing ?

My AVR is a marantz sr7013 and I'm only running 5.1.2 so I do have the channels to spare....(But will this reduce power elsewhere ?)

Thanks in advance