With that though we could end up doing what palace did at Swansea; we play 442 and look great going forward but suspect at the back.
We possibly do have the personel to play that way, but it means either you play with 2 holding midfielders in the middle, so all your creativity comes from the wings. Or you play with only one holding midfielder. This means though that the one holiding player will get caught out on the break and will find himself outnumbered 3:1 in the middle.
The other issue is who plays up with Lukaku?
Kone? Valencia? Calvert -Lewin? I'm not sure we have an effective second striker at the moment.