If the T.Rex was a scavenger could other Tyrannosaurids be scavengers too?

Possibly, but t-rex was bigger than any other tyrranosaurid (that we know of). Tarbosaurus would be like the t-rex of Asia nano-t was to small for a scavenger and albertasaurus wasnt as havily built as other tyrranosaurs. T-rex was probaly in a similar niche as a lion today. It probalyscavenged less then it hunted.