Looks you are crazy with bet for Real Sociedad than Barcelona play on their home, indeed have winning La Liga tittle I don't think with Barcelona loss point in this game. Has important thing for Robert Lewandowski become La Liga top scorer in this season remaining four goals from Karim Benzema. Barcelona won't loss top scorer and always give support for Lewandowski scoring many goals again in several matches left exactly against Sociedad will be good opportunity for him.
NO, he isn't crazy but he considers the possibility.
We all know that Barcelona already won the La Liga title, so the result of the remaining matches won't be important anymore. The remaining matches are just like an exercise match or a friendly match for Barcelona. We can guess that Barcelona players won't play aggressively, or they may play for fun only. Even if Lewandowski may target to score as many as possible, it is not the priority anymore. Lewandowski leads 4 goals, it is quite safe for him to win the top scorer.
Xavi Hernandez won't loss in the from of Barcelona fans actually they have very quit well and consistent performance in La Liga, not matter have won La Liga tittle in this season but Barcelona keep trying give the best for their fans and winning against Sociedad make them more confidence celebrate with La Liga winner in this season.
Xavi may try to keep the players playing at their best form. However, I assume Xavi won't force them to play 100%. Winning at home is always needed for pride, but it is not a must for now. I think Xavi will start to change the main players with substituted players in starting eleven. He will give enough time for substituted players to show up.