Kalidou Koulibaly:
The former Napoli defender has now had about a month's worth of games at Chelsea, and at no time has he looked like the towering presence that lorded over Serie A for so long.
Koulibaly was at least partially at fault for the opener, with the Senegalese and Wesley Fofana both involved. That, most likely, is a result of playing alongside a new team-mate, with the two certainly needing time to adjust to each other's tendencies.
If it were in a vacuum, you could excuse that goal. Yet Koulibaly hasn't quite looked himself since coming to Chelsea, with this goal only the latest example.
Is it just new club jitters? Does he need more time to adjust to his new surroundings after so long in Napoli? Or should Chelsea be more concerned?
Time will tell, but they'll need Koulibaly at his best going forward if they're to compete at the top level.
Chelsea's attack:
It's almost like they were playing FIFA without a shoot button.
Each and every time Chelsea got into a dangerous situation, things got too cute. Kai Havertz, Raheem Sterling and Pierre-Emerick Aubameyang, the trio of starters, were either too selfish or not selfish enough, as virtually every promising attack ended with a Dinamo tackle and clearance.
It isn't just the fact that Chelsea were shut out by Zagreb, but rather how they were. Eight total shots, two on target, and very little to care about other than that.
Romelu Lukaku is gone. So too is Timo Werner. The club has brought in stars like Sterling and Aubameyang to breathe new life into an attack that hadn't been good enough.
Things have yet to get better, though.
Thomas Tuchel:
Managers often get too much blame and too much credit. Players win games, after all. A manager's job is just to set them up to do so.
But Tuchel must take some criticism for what we've seen from Chelsea.
Hindsight is 20-20, of course, but a double-pivot of Mount and Kovacic was never going to work. Returning to a five-at-the-back system, Chelsea looked frail defensively and clueless in the attack against a Dinamo team they should have steamrolled.
Part of that is down to the players, of course, who weren't sharp or decisive enough. But blame also has to fall to the manager who continues to see his team struggle with basics.
Despite the millions of dollars spent to bring in players, Tuchel's Chelsea look like a poor imitation of what they could and should be.