I'm not disappointed maybe because I always felt it was Chakor who'll fall in the trap and not Suraj. For me Chakor sees the world as black and white, people are either good or bad and so far she has no reason to doubt Karan, he's a famous business man and is respectable enough to be invited by the committee to give the prize so why should she think he's bad? Also Chakor is the brains, she needs evidence to doubt people, while Suraj is the heart, he goes by his instincts so for me it's very natural that it's Suraj who doubts Karan first.
About Imli, I find it natural that nobody recognized her, everyone believe that she's dead and this is an old lady, why should they link her with Imli? The problem isn't the neat fingernails, some people like to be well groomed, it has nothing to do with age or wealth. It's the voice, it's a young woman's voice but that's Vidhi's limitations. The trick of a person in disguise has been used before even in Hollywood (Mrs Doubtfire for example) so I wouldn't hold it against the makers. About BhuKa trusting a stranger, old people tend to talk too much and go into unnecessary details and what they said isn't secret, anyone else in the village could've said this but Bhuka are more senior actors.
About the promo, I'll wait until the episode airs, I don't think Chakor will trust Imli, it's probably Imli's imagination.
This doesn't mean there are no illogical things, mainly it's Karan who's not well written, he's very careless in the way he murdered the woman and clearly he keeps a high profile so how come the theft was so blatant. Surely nobody is influential enough to intimidate so many witnesses and make evidence disappear.
So far Keith is doing a good job, Karan isn't supposed to be scary, he's a snake and he should make you feel uneasy which he's doing very well. I still think he's one note and can show limited range of emotions, I hope I'm proven wrong.
I'll hold judgement until I see how the story goes, I need to know how Karan and Imli will go about their plan and how Sukor will react.