That was because if IBF complains on legality. It was wrapped up fast but it changed NOTHING in narrative and story. It turned out exactly how they wanted.
They wrapped Surrogacy fast in 2-3 episodes and then the leap, Leap was introduced with Sai, so she is FL, and if they wanted to show Virakhi and then there will be no Savi, they show Surrogacy successful but also gave Sai, her own child, Savi's presence itself is an indication that makers didn't want to lose audience, plus Vinayak not attached with Pakhi is also one positive indication.......
See at the end the only thing I know is Sai is FL and for Virat to stay ML, he'll have to be in love with the FL, the day he will fell out of love from her and fell for anyone forget Vamp, he'll ceased to be ML and they have to brought new one, they can't show Sai ending up alone, she's FL for star fgs, she'll end up with the ML only, and if that ML is Virat or someone new depends......Virakhi can not work, so if they are planning it then it'll go Tamarind way, they'll be phased out from story gradually and New ML and new Family will take over, which looks highly impossible at this point and hence My bet is on Sairat endgame only .....