Al-Abbas and the Conquest of Mecca

There is only one person that we know of who did this and that is the uncle of the Prophet sassalam. Alabas. And the theory goes that the Prophet had told his uncle to remain in Mecca to give him the news of the people of Mecca. This is a modern day theory. The classical opinion is that he converted late. But we know that he gave the process of information whether he was a secret Muslim or whether he was not yet a convert, his heart was with Islam. So from this a modern theory is that al-Abbas is actually intentionally left behind in Mecca because he's one of the seniors and the elders. He isn't like some lowly figure here