As per Vishal and shamitha, when the time comes karan will team up with pprateek n Nishant.. and thats why they chose to help each other out .
As soon as the time came karan did chose those 2 only to be his partners..
Ofcourse this is big boss, they don't really have a choice to choose there team members when it comes to tasks. But they can chose there alliances..
I think if karan is talking about all fairness he should think from the game point of view and come up with a plan for all jungle wasis to enter the main house. Atleast that's what a true leader would do...but it's just a reality show - very far from the reality .