I agree with bono, on the basis that;
- Biglia can show his best form from last season (IMO he played a big part in our run of form after the halfway point last season)
- Bakayoko can play just as well as CM as he does as DM
Both these things are realistic. However, Rino clearly values Kessie and in general he is relatively averse to making changes. If it ain't broke, don't fix it.
Regarding Kessie, IMO he played well against Atalanta and even before that game showed some good things. Personally I think the criticism for him is overblown.
I agree that Kessié was decent against Atalanta, although he still has trouble making simple things, mostly because of his poor technique to control and pass. I do think criticism is justified. He cost a lot of money, always gets to play, and has done very little to justify either. I am more and more certain that part of it is the role. He's just not suited for what is expected of him in this mezz'ala role. As said before, he's more suited to a Kanté under Conte type role -- play in the center alongside another DM or regista, with plenty of freedom to roam and press and attack players defensively and even make runs, not just stuck on one side, defensively running up and down in a straight line in a more tactically disciplined way, and depending on his technique and creativity to contribute offensively in fairly small spaces. We saw some of that against Atalanta, where he was all over the place, I'd say in a good way.
I wouldn't touch Bakayoko for now. Far out as this may sound, I might even prefer to see Biglia in Kessié's position (again, for now) or switching with Paquetá. Bakayoko seems to have the skillset for the CM role, but really he sucked when he had to play in that position at Chelsea and is excelling at DM. Biglia on the other was not excelling at DM and covers as much ground as Kessié if not more (according to stats), and can do more than Kessié with the ball. I still think that with these guys, in the long run, it seems like 4-2-3-1 might be the way to go.
At any rate, Biglia should get minutes sooner rather than later. Likely he'll come in later against Empoli if possible and perhaps then start against Lazio? If he performs then, we can talk.