I know most see new kairav as cry baby.
But I am seeing him as boy who lost his mother twice and father and had to take on responsibilities early. Who loves his sister akshu to core. I feel they did justice to akshu-kairav bond that was very well done by aarambh by showing kairav attached to akshu.
I remember when akshu was born he was the most excited one, and when he was punished because he was reckless he was missing her soo much even through he met her few days ago, and after naira's death he took care of her when kartik was not in his senses. And even after the 6 month leap before sirat entry he was taking care of her, playing with her and making sure that she won't feel the absence of her mother as much as he could as a child.
And all those scenes - aarambh aced them.
In yesterday epi, I felt he was really missing her and that's why called her. And even in today's epi he was worried about her having panic attacks. And I think he feels closer to akshu because he see naira and kartik in her, after the death of his parents the closest person he has to his heart is akshu. Aarohi to is very precious to him as well, but she is busy holding grudges and being selfish to see beyond her hurt.
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More then akshu and aarohi it was kairav that suffered the most. Lost his parents, was divided between his sisters and taking care of family, everything was on him.
Over all, the new kairav did justice to aarambh's kairav and akshu's relationship when they were kids.