Yes the episodes have been heartbreakingly beautiful. Prabz in effect has left both his son and daughter in Anushka's care. He could tell his daughter, but could not tell Sid. So he indirectly told Anushka. He could figure out they loved each other but Sid would have hurt her in some way.
I feel they would know it is murder, since Prabhz was not ill. So when they investigate they would know the death was not natural. That would get Sid and Anushka to work together to solve the mystrey. Sid had also seen the manuscript that his dad was reading - the makers made sure they show that scene, albeit casually. Sid has been kinda keeping a tab on what his father is upto, since Ira visited them...
Only then will Sid start investigating the airline crash too.
As for the precap, when KK was asked to choose, it seems he chose Prabhakar . he wanted to meet Prabz and ask for his advice if they should withdraw the bid! I could not get what they meant i the other part- did the judge say Khattar was justified in calling his dad chalak???