I was surprised that Barcelona couldn't beat Rayo Vallecano because I see Rayo Vallecano as an easy opponent for Barcelona, and I even played Barcelona in my bet ticket to defeat Rayo Vallecano, but Barcelona held Rayo Vallecano to a draw match through a controversial penalty. Barcelona is always favored by the referee, so I was not surprised with the controversial penalty that helped Barcelona to earn a point against Rayo Vallecano.
Barcelona is a big team based on their previous performance last season a lot of fans expected them to be very strong when they play against teams that are below their standard but the game against Rayo Vallecano Barcelona were not in their best performance you could see that in the ball possession and the attempts they made that day, the penalty that was awarded by Barcelona can't be ruled out because the referee awarded it if it wasn't a penalty the VAR would have signalled the referee for it to be reviewed once again before the final decision. Rayo Vallecano was strong in the game their performance was too powerful and they finally got back in the game to share points with Barcelona.