well when adi said about how he knows dev and kajjal's relations of the past, he said he knows about their business relations.. so i guess he didnt show that he knew about how they love each other...
so heres my prediction....
see when dev walked out of kajjal's room, adi was right outside which means he might have heard them talk about how they have always loved each other😳 and now should forget about each other.. so he made up a plan to only pretend to know that they worked together so that he can just invite dev to the wedding....
so then at the wedding, they might show how kaajjal sits at the mandap with the dulha being there.. she reluctantly does the pheras and sindoor and mangalsutra rituals constantly remembering dev..
after that the dulha should take his "sehera" off and it should turn out to be dev😃 so then adi will explain the whole story of how he finally lost his goat-brains and got a human brain...
and thus, this will bring the goat-brainer's track to an end.... 😃