In my last few contracting roles, when I arrived in the agile teams, there were BAs already in place, along with solutions architects, product owners, service managers and tech leads, etc. It took some time to understand what each person actually did, because even though each time I joined a new team the job roles were roughly called the same thing, the actual role that each person did was often slightly different, depending on that person’s interpretation of it, as well as what needed doing in the team.