I don't know man. From an attacking perspective, Davies really carried a lot of the load the last 2 games. I will agree that today there was a period of the game where he tried to force it, in the last 10 to 15 minutes he was attempting to do too much. Before that though he was magnificent with the ball at his feet, he drove at the Uruguay backline, shook off the defender, and was playing great on the half turn. I don't think there is anyone that can mirror that dynamism on the team.
I don't think the CAM role is experimentation, Herdman mentioned he wants Davies in more advanced positions, and this way he can pick up the ball higher up the pitch and apply more pressure to the backlines. Plus why move Adekugbe out from the LB role where he has found a lot of success in the past 6 months? Doesn't really make sense to me.
When it comes to playing Belgium, we will be going at them when we get the chance. There is not much pace on the backline and the Witsel is still a relied upon member of the double pivot despite losing a step. Plenty of experience sure, but Herdman will set up to have quick options that can try and isolate Vertongen, Alderweireld, Meunier, etc. Debast is quicker but on the inexperienced side of things and has shown some holes when playing against better opposition. Basically, there is plenty of opportunity to attack with speed and it makes more sense to have Davies in those spaces.