I do agree with you...Shivaay being illegitimate would be smokescreen ...They ( villains which include Kapoors, Kameeni, Ranveer, Daksh and Roop ) know that Shivaay is one who keeps the flock together--- an attack on him where it is hurts the most would stun him for a while ---give them enough leeway to attack the rest, I think all three scenarios would play out simultaneously...