Can you stream to individual speakers once they are grouped?

No I haven't used Chromecast Audio, so there is apparently a disconnect.No I haven't used Chromecast Audio, so there is apparently a disconnect.

It's minor complaint, overall I am enjoying the Sonos ecosystem! Last weekend I connected a Sonos Connect to two 8" KRK Rokit monitors, and it sounds awesome! I'm planning on connecting another Sonos Connect to my TV in the living room, and two KRK Rokit 5 monitors.

So here's a question to compare this scenario with chrome cast:
One thing I love with Sonos is the fact that I can start listening to radio (example only) in the living room, I then want to listen to the same in the kitchen and group living room + kitchen. Once I'm done in those two rooms, I can go to the grouping option, un-tick BOTH living room and kitchen, and only tick bedroom. Music will stop in both kitchen and living room and simply start in bedroom - with exact synchronization and without any gaps etc. How would this work on chrome cast?

So here's a question to compare this scenario with chrome cast:
One thing I love with Sonos is the fact that I can start listening to radio (example only) in the living room, I then want to listen to the same in the kitchen and group living room + kitchen. Once I'm done in those two rooms, I can go to the grouping option, un-tick BOTH living room and kitchen, and only tick bedroom. Music will stop in both kitchen and living room and simply start in bedroom - with exact synchronization and without any gaps etc. How would this work on chrome cast?

I don't believe that is possible with the Chromecast Audio.

Basically chromecast creates permanent groups in a list with individual speakers with gui's, and you just cast to whatever single speaker or group you want. Then stop and re-cast to something else in the list. So the music will stop for a few seconds whilst it establishes the new cast.