Lookman has potential there is no doubt about that, he has looked good in the games he has played for us and I believe this will be his breakthrough season. Mirallas is good enough he is just inconsistent. Bolasie will be back before Christmas. Which is why we need a winger or wide attacking midfielder.
Klassen wherever he plays, and I think it will be in midfield, we will not need to play 2 holding midfielders against most sides, is creative and will make chances. The same apply's to Siggy, although I think he will play in the front 3.
Plus we have Rooney, who although not a striker will link up play well.
We will be a better attacking unit than we were last season when we have a striker, at the moment we have creative players but no focal point, like an orchestra without a conductor.