As we have seen, Whatever way Dev takes it's being blocked by one or the other.
He tried to get Nithya's diary but couldn't atlast Durga herself had given it. He tried to find out toren pages in the diary but he couldn't.
He very well understood Sakshi's game plan in the wedding. After the wedding onwards he has turn cold towards Sakshi.
When he came to know that Shaurya truly is the culprit n Rajnath n Sakshi saved him, he turned cold towards them. He started taunting and speaking sugar coated words.
Now he is trying to get to evidence but he will not get and Agnihotri's death will come as a shocker to Dev. He will be pissed off at the turn of events and I hope he will definitely figure it out that his family is behind the lawyers death.
So Dev is being pushed towards the extremes of his patience level, I really hope he just emerges as powerful n smart as the ladies in the show. Instead of getting frustrated and showing his anger on Durga, I think he will need to buckle up for the battle and play it smartly.
If CV's take this way, then the show will definitely be wonderful.