I just completed this repair, replacing the Headphone Jack/Lightening port, battery and iSight camera all at the same time. I removed everything as it explained in the guide, but can totally see how not removing the logic board would save time and isn't 100% necessary. I imagine that peeling the upper portion of the headphone/lighting port is slightly easier with the logic board removed, and you don't have to worry about that antenna cable. If I did it again, I would probably still remove the logic board.