Worth noting that MB never looked to play Forshaw as a defensive midfielder. He also seemed to see him as a box to box midfielder. Whatever he saw in KP he presumably didn't see it in Forshaw and didn't think it was possible to weave his magic on Forshaw. He saw something in KP and probably because of what MB managed to achieve with KP a lot of fans seemed to think he could just do that with anybody. Admittedly he did work his magic on a lot of our players but some players you just can't teach.
Absolutely right, Forshaw nowhere near as good a moving into space brain as KP, so he found another use going into that forawrd role, which he might have been very good at if he weren't crocked all the time.