Regarding Manik's character growth, not only me me you and you, we all have been constantly but on separate occasions, shouting about it from rooftops (mostly this AT's only) but I have no hopes of them being addressed at all.
Aditi, Manik's character sketch was definitely well defined to start with but somewhere along the way, it became marred and over crowded with too many traits that border and some reside totally into the psychological territory.
And all of you, especially Sadhana (from your medical experience) would be knowing that once we enter into this zone, is totally a different ballgame. In this area, nothing is definitive and everything is variable, expecting and making allowance for the treatment/cure/progress to playalong as and in whatever form it manifests. The line between what's foreseen and unseen, what's a given and not so much, what's correctable and not so much becomes next to non existent. So given the psychological touch, character growth easily goes for a toss because there's lots of room, a wide berth, to play around with as and when the need arises.
The very reason for which I liked yesterday's episode so much is, I finally saw a Manik in his senses, showing some will to fight alongside Nandini, to save MaNan. Yesterday, despite his idiotic egoistic words thrown in just to maintain his fast crumbling facade, I saw a Manik, no more confused and wool-headed by his toxic rage and tunnel vision. finally he is ready, reconciled and willing to save the most precious being he knows and give her a hand, in whatever warped way he can. At least, its an improvement (however fickle) on the manik of last two weeks who was all but hell bent on pushing, shoving Nandini's light into the ominous jaws of darkness that have been eating him up alive so far.
End point being, Manik's character is definitely tainted psychologically so, even whenever he improves, we should be mentally prepared for all kinds of regress because eventually, his deep running damaged streak thanks to his childhood with nyonika can be thrown in for justification at any given juncture in the story.