Barcelona are still unstoppable against weaker teams. Cadiz couldn't resist them too much just as everyone expected. Xavi's system is just working smoothly in the La Liga and it is obviously enough for the championship as well. However I won't be saying the same thing for the tournaments like the Champions League, Europa League etc..
In these tournaments they have got very bad results in general so far. They are really struggling to beat big teams in such tournaments now. Xavi still can't find out a solution for this.
It is no surprise at all that Barcelona crushed Cadiz to extend their winning run and increase the gap away from Real Madrid. Xavi Hernandez has cultivated a winning mentality in his team and they go to every game fully motivated and determined to win, I give a lot of credit to Xavi whom I believe is the driving force to their success this season.