I would go for Freddy-Vivek, and not so much for comic relief than that trust and understanding between them. I like how Vivek has that immense respect for Freddy despite his certain er, shortcomings, and says somethings in a well, pulling leg kinda way, but not disrespectfully. Unfortunately, FW has not been able to characterize these 2 properly. But like someone said, Vivek's dialogue in AC 7(I think) said it all "Sir, main aapka Vivek bol raha hoon". No offense, but I cannot see Daya-Abhi apart from each other, I mean, it doesn't suit them at all, or maybe its just me