My opinion is still that with a core from the last season=a team plays meh to ok, but they are at least consistent.
Lenglet-Pique-Roberto were back.
Busi-Raki back.
Messi-Suarez back.
This team will probably lose in the same way in a CL, but for La liga, they are good enough for a title.
The problem is that the other option, a team with too many new players: is too young, players don't have mutual understanding and chemistry.
And their quality is often questionable.
Imo, with a team from yesterday, we will consistently get 7/10 level of performances.
Nothing too special, but okish and consistent.
Regarding defending, in the last 3 matches, against Dortmund, Atletico and Mallorca, Rakitic has made:
4 tackles
6 interceptions
4 clearances
2 blocks
=16 defensive interventions in total.
Arthur, who played as a CM till now has:
8 tackles
3 interceptions
3 clearances
0 blocks
= 14 interventions in his whole season in La liga till now (9 matches)
Rakitic started a season with 0 tackles and interceptions per match.
With more playing time, his numbers have really improved.
Also, in the last 300-ish minutes, he added 2 assists.
People expected that we will crash in December.
Yet, with a return to a lineup similar to the last two seasons, we are playing similar as back then.
More consistent, less chaotic, more consistent results.