I agree, our bench has improved a lot. What I'm saying is, to maintain or improve upon our current league position next year, we will require much more than one quality player. The age of our squad is high, with 9 or 10 first team players the wrong side of 30, we need to start replacing some of them. Not mentioning the obvious fact that we have 2 or 3 key players on loan who may or may not be here next year.
The point I'm making is that one £30m signing of Lukaku, as good as he may be, would not be the solution. I'd much rather see us buy three £10m players or four £7.5m players, which would add greater value to the team overall.