Dont think, it will be any good for Adi' character if he becomes a mantri. Because, with Navya's case and how the Pradhans wronged by saving Omi for so many years, Adi tried to save Omi..etc. Kavya/Bansals will be certain that Adi is also on the same path as Giriraj/Pradhans and can do anything wrong.
This will only be for drama, will not do anything good to the story/plot of the show, unless that is more important.
In the end, like the pre-marriage ddp track, Adi will be proved he was wrong and he will regret for all what he will as mantri, because its Kavya's show and nothing can go wrong with her character.
So, even if Adi's character looks a bit of positive with his attempt to tell Kavya the truth/guilt/fear of loosing her..etc, it will not have any meaning, if he becomes mantri.