Give credit where it's due. If anyone thinks that these three games have been down to "playing for the manager" alone, then it's the absolute height of ignorance and naivety.
Two full-backs holding a high field position isn't happening due to an increase in morale.
Pogba finding himself higher up the field isn't happening due to an increase in morale.
Three attackers interchanging isn't happening due to an increase in morale.
A higher overall field position for ten outfield players, again, isn't happening for the above reason.
Nor is the increased pressing, amount of key-pass attempts, shots from range, etc.
Ole isn't morale-ing performances out of these players as a unit. There's some very deliberate and obvious tactical instructions involved in the last three games; non of which, are down to an increase in overall happiness alone.
Ole knows what he's doing. Everything from the high line, to the high press, to the high full-backs, to the interchanging 3, to the elevated Pogba field position between lines. All these things can be verified by his learning and work involved at Molde. All of these tactical similarities can be traced to his Molde team. There's a definitive attacking approach.