Adding additional prosecutors to the cases is not backing away in humiliation.
No and as the article alludes, the length of the case will likely exceed his time as SC, so they'd take it from there. A good deal of misinformation has been spread, as an attempt to discredit Mueller. It just ends up making the outlet look foolish when you know the full story.
For instance, in the opener, the prosecution argued the defendants had not been properly served. The defense ridiculed the motion to delay for that. However, in the next court session, defense counsel agreed the client had not been properly served. Press reports said Mueller had requested an indefinite suspension for discovery. Actually, he had requested a delay of 90 days, after defense asserted their right to speedy trial. Then, strangely enough, defense counsel joined the prosecution in the delay after Mueller turned over 2TB of social media data, untranslated, in Russian.
It was kind of funny, actually. Defense needed time to translate it. The prosecution already has their translation, but they turned over the Russian data as a double eff you to the defense. He's basically saying, "You want discovery? Discover this. Besides, your client knows what it says."