I agree on the ITV trope bit. That's why my guess might fail.
V can win a king crown, Saavi wants a queen crown. So unless P is 'sacrificing' enough, Sai has to win it for her.
The parents already know they are exes. P stupidly put the cake shop owner on loudspeaker... everyone (teachers and parents) has heard it that it was their anniversary. I am surprised Saavi and Vinu didn't react to it.
What I feel is if the makers want to show Sai V know each other better than VP ... then Sai V have to win. That's what P corroborated.
That there is a deeper connect between V Sai even after separation and not between VP inspite of so many years.
But did they explicitly show there are two type of crowns king or queen crown otherwise VP losing seems probable. Ther were playing for Vinu so he'd get king crown or he'd win choose queen crown for Savi!?
P is sacrificing what? Didn't get it.