I don't blame Tuchel for anything for now. I'm just waiting for next season to see what this team will do for real. Because now Tuchel has a lot of time to prepare the team for a new journey. He had better use this opportunity effectively. As long as they complete the striker signing we should be seeing a more stable team already.
After that it will all depend on using the right game strategies. Tuchel is a Champions League winner manager as you know. He is a really great tactician and it was wonderful how Chelsea made it to the title with him. He would surely aim the same thing this season even though the job is quite difficult. If we see a consistent team then I expect them to be much more competitive in the Champions League unlike the previous season.