#4 King Corbin interferes; AJ Styles defeats Elias

Elias is currently involved in a rivalry with King Corbin on SmackDown. The Drifter had defeated his nemesis at WrestleMania 36, and he even emerged victorious when the two clashed in the first round of the WWE Intercontinental Championship tournament. Besides, Elias also cost Corbin a win in the Money in the Bank ladder match earlier this month.
These developments suggest that this feud is far from over, and the fans would get another one-on-one bout between the two Superstars at Backlash. The best way WWE can set up that match is by booking the former United States Champion to intervene in the proceedings on SmackDown. He could come out to attack Elias during his fight against AJ Styles, or to avenge his loss, he could distract the referee when The Guitarist would get his opponent down.
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Either way, to ensure that Elias does not stay alive in the competition, Corbin would assist AJ Styles to win this match. Given that all the Superstars remaining in the tourney are fantastic wrestlers, it would be great if WWE books a finale with no outside interference, and the fans get a clear winner.
In case Elias makes it to the finale, things could become a bit predictable because of his bad blood with King Corbin.