Dunno but i have this feeling that Pahua is also unknown of this truth..He is a little kid and for him his Raju bhaiyais everything so do u think Dev will tell the baccha that he was raju's humshakal
About Dev's conspiracy i too think that he dint know about karan and Ameesha's plan..he thought it was coz of mahadasha but this might have stuck his had na ke if this was mahadasha then how was he saved,he was to die according to sidh baba . therefore he planned Kaajjal's Rajgani trip and evrything which followed..
WELL ANU U HAVE A POINT.. lekin if u notice.. many times raju has not known what to say and paua covers up for him.. so maybe that is a hint naa?? that even paua is involved in this story with raju (dev)