So as per the scene Gurunank came in the form of Sadhu to give prediction reg Santosh daughters. Okay, God can come in any disguise which is totally fine.
Talking about how the scene , Babaji stressed that Sahiba would be the richest among the three daughters. First, she will be marrying Angad who is the CEO, secondly the guy will give her everything and in return she will give love to him and his family.
Rest two daughters were only said that they will get good guys. Sahiba character was described as the kind and someone who do for others or do good deeds are always blessed by the gods. That's why she is god's fav.
Seerat will get everything but won't be satisfied with it. Just like Jasleen,she will have to hear taunts as Bhagodi dulhan throughout her life. No matter whatever she does, her evil side will come again and again.