Why you assumed for sure Duncan would have returned if I see London challenge was declared won by Owen and Noah? Also, have Duncan returned it is likely that Courtney or Gwen took the boot for having singlehandedly screwed the challenge (also Sierra would have gladly joined Heather and Courtney in voting Gwen, ans given thar Cody votes Sierra in every scenario that would have meant Gwen having more votes than Heather.)
Good video though at 6:48 I will argue in the original timeline Tyler had outlived his usefulness being pretty injured after the challenge (I know injuries work definitely in total drama but still) and he could just go after Courtney himself and it be easier to convince people to vote out Duncan than Tyler which is assuming he did vote out Tyler I don't remember if they showed the votes for that episode but I always thought Duncan and Tyler voted for one another and alejandro honored what he agreed with Duncan earlier and just voted Owen leaving Owen as the deciding vote and he voted out Tyler cause he cost them the challenge
