The La Liga is Barcelona vs Real Madrid. There are no teams as strong as the two. Right now both have the same exact points and goal difference. The difference arise when these teams loses points to some random teams. There's no certainty which these team would be. Barcelona nearly lost some points against Levante. As the two teams has yet to play against each other and the same team, its still difficult to decide which of them are doing better.
Barcelona still is missing Lewandowski and the news is he has recovered and going to play next game. This could further boost the confidence of Barcelona.
Barcelona made a good comeback, nevertheless they were at huge risk at some point. A similar mistakes should not be tolerated because Real Madrid seems to be fine until now and Villarreal is doing pretty well too.
For Lewandowski, he certainly could help the team once he returns to the field but his era almost came to an end so they have to get used to play without him and not seeing him playing the whole game in the upcoming games and years eventually.