Let's not act like the Canadian version has been good from season 6+. Every single aspect of the game has been played out. It's a simple concept to align with the comp hoes and take outeveryone else out while keeping non allies close and convincing them you're with them when you're not... just in case they win HOH, but they won't win HOH cause they suck @ comps. Bam!
No matter the cast a group of strong people will always end up working together and not turn until the very end because it's a proven concept that has worked season after season after season after season.
Survivor still works because it's not a comp heavy show (@ merge). You can align with anyone because everyone has the same power.. the power of 1 vote. Big Brother if you can't win comps you're useless.