I doubt that Barcelona didn’t study Rayo Vallecano before this match, but that doesn’t change the fact that Rayo Vallecano have an excellent defense, and they should have expected that they would defend. But Barcelona didn’t try to force the game until the moment Rayo Vallecano equalized, and after that they were unlucky because they couldn’t adjust for the rest of the match. So in this game, the draw became possible only thanks to the hosts’ defense.
There was no need studying them since they were not equality with those other two clubs they recently won because I take Levante to be performing than Rayo as well as Mallorca so it wasn't a game they have to make Barcelona started studying them but unfortunately the troubling of the match hamper there progress and instead of there usually point it became too unusual for them and they couldn't win through just a goal but the league is free for them because neither of this two team that is topping in disguising will remain at that extreme because nowhere has locked for Barcelona.