I think that brother's scene was necessary. They badly needed to focus on brother's bond, because they have epically failed in phase 2 to show that too. In that scene when Atharva heard ravish's voice all that 27 years of pain that he and her mother lived came in front of his eyes. Ravish is living in a big house, without any taunts, and without a tag of fatherless, which was actually Atharva's right. For Atharva, ravish and suman was the reason why his father was not with them. And now he took away his vividha too, and is implementing all those rights which was only his.
I don't know if you or any of the ravish fandom noticed this or not, but me including couple of vitharv fandom noticed it that Atharva was beating Ravish only till he can fight back, but as soon as ravish became defenseless he stopped and broke down himself. Unlike ravish, who keep beating baby Atharva until sujata has to intervene to stop him from beating Atharva.
Karma is a b***h. What goes around, comes around. In Phase 2 we saw Ravish chaining, slapping, beating BABY Atharva who was DEFENSELESS based on an assumption. In phase 3, we saw Atharva beating Ravish for the mistakes Ramakanth did, and also for getting Married to vividha without knowing the whole truth to a DEFENSIVE ravish.
With the upcoming track Atharva and vividha will repay "debt" of ravish by saving him and bringing him back home safe and sound.