I think the team that Xabi has only needs some slight changes, not a total overhaul of all lines. They have good players on the team. However, their performance may have changed with the implementation of the training patterns and game strategies applied by Xabi. They need to adapt and quickly adjust for team cooperation. Managing good players is certainly not easy.
I expected Barcelona to focus on strengthening their defense this season. But Barcelona did not buy any defenders. Barcelona only bought goalkeeper Garcia. I think barcelona needed another experienced defender in their squad.
Since Barcelona performed well last season, so that Hansi flick did not try to make any changes to his squad. As well, we know that Barcelona management is in financial crisis. Perhaps this is one of the reasons why Flick did not put any pressure on Barcelona management to spend money. We still do not know whether Barcelona players will be in the same great rhythm as last season next season. However, since the bonding between the players is very strong, good results can be expected from Barcelona.