for Sheena, she sees Gunjan as a roadblock....she thinks Gunjan is the reason Samrat doesn't give her enough attention.
According to RV, the plan will solve both SHeena and RV's problems. So the plan needs to work for both of them, that is, IF RV isn't using Sheena. Big IF. There's a possibility he could after seeing Sheena jealous of Gunjan. RV could be taking advantage of this fact.
I think the plan is to show Samrat in a poor light in front of BOTH Dia and Gunjan, a plan that will make both Dia and Gunjan hate Samrat. But Gunjan won't cuz she trusts him too much. as for Dia, I can't say for sure.