In the above story .... see the words .....................
Manthara said, ‘Oh! My dumb Mistress! Don’t you realize that if Rama becomes the king, even Kausalya’s servants will disrespect you? You will be trampled once Rama is crowned. Bharata will be doomed!’
Kaikayi was a power centre and Manthara might have taken undue advantage of her position and must have even disrespected other queens, in the past and to which Dashratha as well as Kaikali would have ignored it?
So even those days, there was a tendancy of the subordinates to misuse position of their 'influential superiors in the organisation.
The story also tells 'People tend to be nice as long as they are the power centres and show broadness of mind but with a pre-condition that they should continue to be influential powercentres. .
Kousalya wasn't in the race to be influential as Kaikeki. But fell short to safeguard her interests, if she had at all as personal interest and preference towards Rama as her son.
Kaikayi was enjoying the power and had no problems bestowing love on other kids as well, but it was as long as she remained as the power centre and she was the power centre because dasharatha was tolerating her.
Does anyone know whether Dasharatha gave also promises to Kousalya also or NOT? There may be some untold story as well in the epic tale.
Most certainly Dashratha might have given promises blindly to rest two wives also !!!
(Evidence as to character 'of giving promises inexcitement' blindly, Should we not ponder over this possibility?)
Probably Kousalya may not have exercised those promises to square off the promises given to Kaikayi!!!
The ONLY BIG Lesson here is that!!!!
Never .. Ever ... give any blind promises to wife !!!
Its better to Appoint a lawyer!!! and put all if and else conditions in it. and also put a small type faced note that 'Subject to final discretion of promissor'!!!!