No way we let go of both Giroud and Tammy without bringing a CF in. So at the very least, it's 6. CHO looked great at LW against Everton also, so he is still going to be considered an option there. That is still 7 players for 3 spots. Sustainable? No way. The dressing room will be chaotic.
Konate has had two lengthy spells both from the same hip injury. A year off of football rehabilitating, he hasn't had any issue. He was only out this season due to an ankle sprain. This isn't Pulisic we are talking about where he is getting injuries left and right from all different muscular imbalances. He's worth the risk, IMO. He wouldn't be displacing Christensen, he'd be displacing Zouma.
It's not about giving up control, its about controlling the game whilst still getting the best out of our attackers, which this current system doesn't do. I'm not saying making changes now, I'm all for sticking with it to secure Top 4, go far in Europe and potentially win the FA Cup because it A, works, and B, it is still progressive football. My point is that as tactically flexible as Tuchel is, he definitely wants to experiment with other formations that get the best out of his attackers, as he has done so in the past. Rudiger/Zouma/Christensen are not top tier defenders for a back 4.