All I can ay is, all of those people were not on the bus that arrived at the prison at the end on season 3.
They've been picking people up from various places and bringing them back to the prison. Mostly Daryl, I think. That first episode they were treating him like a rock star for saving them.
No one really saw who was on the bus so how can you make that statement? And does it really matter?
What should be noteworthy is that "whomever" were on the bus have become the necessary victims for this season's to-date episodes..........