There are various possibilities behind this property transfer:
Firstly, Shuarya transfers all his property to Mehak's name but then Kanta returns everything saying now she has full faith on him. But then Shaurya asks her to keep the papers with her saying what difference does it make whether it was with her or him...so definitely there is a reason behind the papers being with Kanta and also the fact that this conversation is just between Kanta and Shaurya - so there are possibilities that in future something will happen to Shaurya - Death, memory loss, abduction, going missing - could be anything and then Mehak and her children get all the property rights...
Secondly, Svetlana too shouts at the goon saying he has now failed 3 times in trying to kill Shaurya and asks him to go now saying he was fit for nothing. Since her plan to kill Shaurya did not work she may now try out other means to get Shaurya's property as from the start she and Sanjay are after Shaurya's property and somehow trying to stop Mehak getting married with Shaurya . So now she may try something like abduction and forcefully try to get SK's signatures on property papers. Even if she managed to do it, these papers will not be legally valid as everything would have been in Mehak's name...
Lastly, at the moment everything looks fine with Shaurya and he is in the good books of everyone. But Shaurya being Shaurya what is the guarantee he will not go back to his old self - Shaurya 1.0? So, in case the makers chose this route, then SK may chose to portray this entire property drama to his advantage (as no one else other than Kanta was involved) in separating Mehak from Kanta and her entire family saying this is the price he had paid to get married to her and that her family is indeed greedy like he had assumed them to be right in the beginning. This will be followed by a big MU...
Thus, this property drama by Kanta was a weapon used by the CVs for future track involving SK...there is certainly more than what meets the eyes today...