I really don't understand the animosity toward Tyler, in particular – especially during a season that had an actual execrable camera whore on it for her third time – but oh well.
For the sake of information, it wasn't all three TAR teams helping each other and deliberately excluding Nicole and Victor. It was Tyler and Korey and Colin and Christie teaming up and helping each other whenever possible and convenient because those two specific teams were so genuinely close with each other during the race. Leo and Jamal have said in post-finale interviews that they didn't care who the other two teams were in the final leg with them, as long as they themselves made it to the final leg. The producers obviously fed T/K and C/C the question about having an all-TAR final three, and both teams said that would be nice, but they weren't like, "Fuck Nicole and Victor! We hate them, and they must be annihilated!!!" And because this isn't Survivor or Big Brother, those two teams couldn't have really effectuated that outcome anyway (and I'm sure both teams knew that because they're very experienced Racers) because this show is primarily dependent on your own ability as a team to accomplish whatever tasks required; you can not want another team to beat you, but there's not much you can do about it if they can finish a task before you can. Which Victor could, clearly. If you listen to or read any post-finale interviews with Tyler and Korey in particular (since they seem to have been asked about it more directly than Colin and Christie from what I've come across), you understand how serious and deep the bond between the two teams was. Korey said to Rob Cesternino, basically, that it didn't occur to the four of them not to help each other because they were so close and wanted to see each other do well (I have no evidence to back it up, but I kind of think C/C wanted T/K to win the Uganda leg because of what it would've meant to them). Like, there was never a question that they wouldn't help each other, if possible, and that really wasn't directly about trying to screw Nicole and Victor so much as it was about wanting to help and race with people you love.
Honestly, the reason Nicole and Victor lost the London leg was because they tried to do the rowing task for two hours before switching. With only four teams left, you have to be clear and decisive with your Detour selections; Tyler and Korey and, especially, Leo and Jamal knew pretty quickly that the rowing would not be able to be finished by them in a reasonable amount of time and switched without too much hesitation. Nicole and Victor spent wayyyyyyy too much time trying to grind out that task without actually figuring out a system for accomplishing that task that would work for them. Had they had the wherewithal to realize after even a few attempts that they just didn't have the focus or comprehension to figure out a feasible way to do the task, they would have switched much sooner and likely knocked Colin and Christie out because they only seemed to need four or five attempts at the taxi Detour to finish it. However, because they only bailed once they had bled so much time, time that allowed Colin and Christie to catch up, they basically lost their advantage and sealed their fate. They switched out of panic, and it was the right call in terms of switching to a task they could actually do, but they needed to make that switch with clearer, more rational heads much sooner. With a team as formidable as Colin and Christie, you know they'll find a way to figure out that rowing task fairly efficiently, and that's exactly what they did (using the only system that could possibly work with inexperienced rowers). I think if Nicole and Victor came back, they'd be much wiser Racers and have the clarity and ability to make quicker, more informed decisions that the other three, experienced teams had. That's really why, in my opinion, we had an all-TAR final three, even though Nicole and Victor were certainly a very strong team in their own right. The Race wisdom won out in the end, whether or not a few teams were helping each other.