Indeed City played a great game but they need De Bruyne back as quick as they can if they want to go back 2 back UCL champions. This season is way hard for them to conquer the trophy and from my point of view , I do think Bayern are the 1st favorites and then City and Real but you are right , De Bruyne presence will be felt as soon as he steps on the pitch and City also needs him for EPL fight. 
I don't know what you guys think about him, but Doku from Manchester City is something like the little surprise of the season to me. He is developing incredibly well and I like to see him play with his pace and physical strength. What an awesome player at such a young age and he will only get better from here. I checked what he has done so far because I didn't know his name before he played for Manchester City for the first time and it is quite impressive that he has been around in professional soccer for 5.5 years now. He is 21 years old. I think he is a great talent with lots of room to improve and to play an even more important role in the future. Pep Guardiola is also counting on him.