I'm sure you mean playing narrower rather than inverted. I didn't see the press conference and didn't notice him make the change last night, but I can see that Zin and Walker didn't tuck into midfield too much and gave us width. Weirdly, having that system with attacking fullbacks caused us problems in the first quarter of the season because the ball kept ending up with Mendy and Walker who were wasting possession. Pep changed it then but I need to watch the game again to see when it happened and what difference this change made. More men in and around the opposition's penalty area I'm sure.