Sarah Hrejsa may not have been the best competitor in Big Brother 6. Heck, she wasn't even invited to participate in Big Brother 7. But James Rhine was.
You see, James and Sarah were playing both sides of the house until they were discovered and then both nominated for eviction. James won the Power of Veto and took himself off the block only to be replaced by Ivette, but Sarah was nevertheless evicted.
While being angered by Sarah's eviction; he found the power to hide behind the bushes somehow and see 3 other people be evicted before himself: Kaysar Ridha (for trusting Jennifer too much), Jennifer Vasquez (out of revenge by Janelle Pierzina), and Rachel Plencner (giving up her game over Howie's). Eventually he was found out but bloody hell was he good at staying undercover for a while.
He was then invited back to Big Brother 7 [All-Stars] to have another chance of playing, got tired of the Sovereign 4 [Himself, Janelle, Howie and Kaysar] for their stupid nominations and got himself with the secret alliance Legion of Doom [Himself, Danielle, Dr.Will and Mike Boogie]. If he had not done that, he would have gotten himself evicted quickly as an alliance/athletic threat.
Hands down to James Rhine, technically not one of the best players; but definitely in my Top 20 Big Brother HouseGuests list!