I mean, what makes everyone think Sia's statements will prove Ridhu innocent in front of Vansh? Sia only knows 2 things:
1.Anupriya killed Uma
2.Ridhima was a spy but now she actually loves Vansh
BUT Vansh already knows :
1. Anupriya killed Uma & harmed Sia
2. Ridhima is a spy ( from Sia's recording)
3. Ridhima got Ragini out of safehouse ( from cctv footage)
Still Vansh has decided to move on with Ridhu....
So what will change if Sia wakes up??
Rather, We need someone who can testify that Ridhima was played on by Kabir, that's it. Right?