Saasu di..imagine if the plot plays out this way:
1. Mendu mama met Ahir and Asha in jail and bonded with them over their mutual hate for Kalyani and Malhar.
2. After release from the prison, he could have started the antiquities smuggling and enlisted Asha and Ahir's help.
3. Atharv could have been funding this entire operation sitting in Dubai and making profit.
4. I think the terrorist link is with Avni, her family and Ahir. After Ahir's death, Atharv could have joined forces with her to take revenge on Kalyani and Malhar.
5. As for Nal emporium, I think now that the terrorist ring and the smuggling racket is busted, Atharv is running short on money. That's why he needs Nal emporium.
6. Even in season 1 Atharv returned to AN because Sampu wanted Moksh and even now I feel it is Sampada who made him resurface in Aurangabad to get Moksh.
If the story turned out this way then I ll truly be impressed...aapko kya lagta hain di