I'm not sure if I'm making excuses for him or not- but I wonder if Ole knows what he is doing and is waiting until we get a CDM before he uses VDB.
VDB as a CAM makes runs all over the place almost as a CF rather than a creative player which requires that stability from deeper positions, especially if Bruno plays a bit deeper too but also allowed to get forward (again needing that CDM, which both Fred and Mctomminay have struggled with).
Then as a CM VDB has shown he can play a bit more of a build up type of midfielder role, has a decent ability to get stuck in but probably needs to grow in to the physicality of the league a bit but again also needs someone more physical than Fred and Mctomminay to be his partner when playing as a CDM to do the truly dirty work.
The fact is people talk about how great we looked with Fred, Pogba and Bruno vs Sevilla - as great as we looked as an attacking midfield unit, there was a reason we lost that game. We has no stability.
Whilst I initially had a feeling that VDB may have been a Pochettino signing playing behind a striker, I'm starting to feel that Ole's waiting for the right CDM before we reorganise our midfield around. VDB can play as a goalscorer (almost like a false 9/CAM behind striker or as a build up CM) but the more I think about it the less he can do such a role without the stability of a CDM providing cover in deeper areas.
We all know Fred and Mctomminay are good players but they are both together doing a single CDM players job. Van De Beek has the ability to make deadly runs and finishes into space and Bruno Fernandes has the ability to make those type of passes to find them too but none of this can happen until we get a CDM to balance out midfield out.