This was known from ages. Even before YRF's The Romantics.
It is known from 90s through magazines and articles how it was SRK's idea to add Kkkkiran to made character look a bit psychotic in his obsession and give him a quirk that distinguishes him.
It clicked and became a rage.
SRK has shared it in older interviews too and if I am not mistaken, one of Chopras, either Yash or Aditya, had also spoken about it and praised SRK for making Darr famous.
I am not an SRK fan but still know this.
How can you, being an SRK fan, not know this?
Anyway, honestly Darr is first time I noticed SRK as a kid and for a long time I hated SRK and was afraid of him because first SRK films I had seen, were Anjaam, Darr, Baazigar in which he brutally kills or tortures women. So I was afraid for heroines whenever I saw them with this creep.
It took me a long time to get image of those films out of my mind. I had otherwise even avoided to see DTPH, Pardes, DDLJ, KKHH due to my hate for SRK and fear of gory treatment of girls in his films, at his hands.
My idea or image of SRK changed later, that he is not a woman beater or killing and torturing women in each film.
Though his stalking and obsessive streak in characters has remained sort of consistent, with a dash of misogyny and some sort of orthodoxy.