Benteke would be really effective and better than rom as a pivot to fire the ball into, brilliant at holding the ball up to bring the likes of Sandro, Klassen, Rooney, Mirallas and Sig/Barkley into play. This style would suit away from home and against tougher teams at home.
In terms of goal scoring if you create him a good chance in the box I'm semi confident he would put most away. However, his main threat is areal from crosses and our lack of width right now would make me question how effective he could be for us? This is perhaps why he didn't succeed across the park?
If the rumours are true I trust Koeman and Walsh 100% with their vision on this one. And I guess Rooney, Sig/Barkley and Klassen could still find his head from a more central position with a slight angle.