I raise a few concerns about DJ doing so well.
DJ was reponsible for his team's failure in "Who Can You Trust?" You listed Courtney, Duncan, and Geoff as a tie, but all three of them did better, as he failed two challenges. Geoff won one challenge and lost one, Courtney lost one (although the failure was admittedly Sadie's more then it was hers) and Duncan failed one. All of them do better then DJ, as he willingly took off the blindfold himself
DJ also failed his team in "Paintball Deer Hunt" as he got himself trapped on the cliffside. Owen merely ran out of shots, which is something DJ could not have anticipated. Compared to Duncan and Courtney, both of them did a superior job (Sadie would not, considering she was only saved by Heather's loud shouting)
It is not possible to say that DJ's dish was better then any of the other campers besides his partner Bridgette, as the individual score for the dish was not mentioned at all. Chef gave the first two courses a combined score of 15, but which dish was superior is undeterminable. Geoff was also responsible for the execution of the entire menu, which includes all of the dishes.
DJ's failure in "Not Quite Famous" was due to his own klutziness. While one can argue that Duncan willingly choosing not to participate could constitute a tie, and that Geoff accidentally destroying his own board would force a tie, Courtney's withdraw happened as a result of Bridgette. Courtney could technically be ruled as superior since she did not mess up her own act. Also, Bridgette received the same score as DJ in the contest, not a lower one. Although Bridgette could still be considered worse since she caused the accident that took Courtney from the competition.
The only person we see DJ outlasting in "The Big Sleep" was Bridgette. The score shows that DJ fell asleep second (10 bass remained, Bridgette fell to 9, and when DJ sleeps, the score goes to 8.) He does not outlast Geoff.
In "Dodge Brawl" Courtney was the one responsible for coercing Duncan to get on the field in the first place. Accomplishing this, as well as participating in one round of the blitz manuever, is superior to DJ merely winning two. Further, Geoff and DJ both participated in two rounds of the blitzing manuever. Since Geoff put Harold on the field, that would be a victory for him. However, DJ winning two rounds for the Bass would be superior to Harold winning one. Final ball or no, it was only one round to two.
Bridgette burning down the tent in "The Sucky Outdoors" did not adversely affect the challenge. Stating DJ was superior is inaccurate.
Counting these, Courtney (5-2) and Geoff (7-4) would have done better then DJ. Bridgette (5-4) would still be worse, while Harold's score has no net change.