I go back to sometimes it is the luck of the draw, so to speak. Who do they get as a choreographer, and what kind and caliber of choreography does that person create? The dancers can only perform to the best of their ability what they are given.
This, I think, boiled down to timing. Stanley really did not have enough time to build up a fan base before he was hit with last week to help him survive that performance, and Nigel had to let someone go out of 3 excellent dancers, so he let the one go with the least actual votes this time.