wow no okay, definitely too fast for my taste. 

Too bad they cut the flashbacks from the parts with Earthworm, it was building up the suspense in the novel.
Also seeing how they did this episode, I’m fearing that they intend to broadcast novel 9 in two episodes, when it’s the most important novel when it comes to Izaya’s character and he’s the main villain (I was expecting the part with Chrome to come up at the end of the episode, as an explanation of how he managed to trick both Heaven’s slave and Amphisbaena at least…). 

There are a ton of interesting things in novel 9, outside of the parts with Eartworm and the flashbacks too, and even if they want to end this cour on a cliffhanger (probably from vol 10), I still believe there are parts of the novel that should be shown, if only for everything that will happen in the last cour. 

• Like Vorona offering to kill Izaya for Shizuo, showing that their relationship is developing (it will be important for vol 13), 
• or how the twins were saved from Earthworm’s group (it’s important to Izaya’s character). Or even why the twins grew up to be like that, what kind of influence Izaya had on them. They’re pretty original themselves, like their big brother but in a more complex way than they showed so far in the anime, however that might be asking too much.
• Also, to avoid future problems of people saying that Aoba is a copy of Izaya, I think the part with him and the twins at the pool should be shown, to explain the fundamental difference between him and Izaya. 
• What happens on the chatroom too. There are a few interesting discussions.

It matters because all these things will be important for the last cour when everything unravel. Durarara is about both characters and plot, so if they mess up an important part about a character starting from now (especially for the main cast), it will bite us watchers in the ass for the last cour. 

It’s really too bad since they had been doing fantastically well for this cour, so I hope I’m wrong and that novel 9 will go until episode 11.