question #3 Sahih Muslim 692b, Book 6, Hadith 16 : Why might certain narrators or names be omitted in some versions of a hadith transmission?

This hadith has been transmitted by Shu’ba with the same chain of narrators and it is narrated from Simt, and the name of Shurahbil has not been mentioned, and he said that he had gone to a place called Dumin, situated at a distance of eighteen miles from Hims.