Yes, it was totally unexpected and may be interesting to watch their tashan. But, from the show's popularity/success point of view, it may backfire and it will not do any good.
The simple reason is, viewers have already seen this version of Adi before in the 1st ddp and whatever he is doing currently with Kavya is more like unbearable than entertaining. May be Kavya's reactions are a treat to watch now, but she is being hurt as well badly.
Who will enjoy a woman being tortured like this for long time. Eventually, the viewers will shift away. All the more they will be disheartened to see the ML doing all this, who they connected/loved once.
Eventually, the show's success is what matters, not the drama.