In his latest iv he did tell that he manipulated Asim and everything is in Rashmi's favor now.
This Arhaan was a khabri in the actual sense, he came with information, broke the strongest bond in the house. Both Asim and Sid are mirror images of themselves when it comes to standing on the front foot and arguing as if the world has come to an end. It worked to Arhaans advantage
He worked out a plan for Rashmi, the second time when he came back manipulated everyone and literally focused on Shukhlas weak points, his ego, anger , aggressive behavior, got the most popular face of BB on Rashmi's , went only on Shuklas character. Created such a scenario in the house that even when he is evicted Rashmi stays safe with Asim, Vishal and others.
Arhaan has literally used Shuklas's behavioural aspects to Rashmi's benefit.
In some way its unfair to the other contestants who never got a chance like Daljeet or Koena.