I don't think it is a leap of faith Ric,I think pep has realised he got it wrong in a few of the games,I will be very surprised if he stuck with 3 at the back from now on.
I don't think he'll go 3 at the back as much now, although like others have said I'm sure he'll use when he thinks it's appropriate. I just think saying we'll win the league if he plays a diamond is over simplifying things and a huge assumption based on one performance.