i think replacing Gestede with someone who can actually move would open up things massively for us attacking wise. Ayew and Grealish like to drop deeper, work 1-2s etc - but when they get on the ball they are looking up and see Gestede just standing there.
If you have a forward who runs defenders around it also opens up chances from the edge of the box for midfielders and runners from deep.
At the moment Boro can just stick 1 man on Gestede and hold their shape easily.