ricky, you've got your blinkers on again. maybe the issue is that frimpong looked good against boca because they play a slow, languid latin american style, while benfica as you said, played a much more urgent pressing game. less time on the ball and his inexperience showed.
as for looking poor because his teammates were poor... well at some point, we need players who are not passengers. we can't have everyone looking around for someone else to make the team look good. frimpong is not yet someone we can rely on to keep our team ticking - he's someone who needs a good team to make him look good.