I wonder how much this tinkering is a nod to the desire higher up to play more entertaining football.
Rusk was completely undermined pre-season by MS jumping in on a question about playing more entertaining football and saying he defo wanted to see that.
It’s his money so he ultimately calls the shots. Maybe Chally has been challenged to play more expansive footie. If that’s as the case much better to go 4-3-3 , which he did at Hartlepool IIRC or 4-2-3-1 - of course, the current system may bed in with the current personnel.