I think Adil would have married her in a heartbeat but 1) he was exiled from the house by the family (they showed a clip where he comes to talk to Saba’s mother to explain/talk but she refuses to listen) and 2) if they did get married it would have given credibility to the allegation - Saba wouldn’t have married him.
BTW, I believe, that Sara was “taken” by Adil. No one else in the family wants to tell her the truth because their part/blame in the mess would comes. Adil is the only other victim of the Ta’yii Amma - so he would want Sara to know what the khandaan put her mother through. This is all my speculation.