The Relationship Between Sa'ad and Umayyya

Sa'ad was a close friend of Umayyya ibn Khalaf in the days of Jahiliya. He went to Makkah, perhaps for business trips, perhaps for some other reason. Abu Jahl gets angry and he says, how is it possible that you are performing Thalaf around the house in safety after you have given protection to these renegades? And so Sa'ad says this is Sa'ad Ibn Mu'ath basically from Yathirib. But even if his Islam is not known, what is known for sure? He is helping the Prophet ﷺ. So clearly there might be some tension. Why? Because Sa'ad is now helping