I think the main rivalry has always been paras and asim, if I can recall they clearly disliked each other from day 1, and always had the biggest fights.
Sidd sided with asim at that time and as he is more dominant it became paras vs sid eventually.But seeing how easily they've become the new buddies in town it seems paras's only problem is asim, not sid.
Sid has become just a pawn for paras to use against asim.
What do you think ?