It was costly because we had no plan B. For the period with Lukaky out injured we stuck Rashford up top without changing strategy, it's not like anyone expected that to be a success. We have different types of strikers, the key is to manage the squad and make sure that if your first choice is injured you have an alternative that knows what's expected and that the team can change style to suit the other strikers. Sticking your striker turned left/right winger back as a striker and pretending he's an an entirely different player is usually not going to help.
Ref Tottenham and Liverpool: Fair enough, we can isolate them and look at an individual season and miss the entire point that everyone is trying to make.
It's all about progress, building towards something. Progress rarely happens instantly. Our second place last season was a one off, bit like Everton finishing 4th. Tottenham, having a limited budget both in terms of wages and transfer fees, will struggle to compete over time. Liverpool, who have splashed some serious cash on both transfer fees and wages are expected to compete for trophies. They are undefeated in their last 27 league games at home, it would surprise me if they aren't mounting a title challenge this season, given the way they are performing i expect them to compete with City. Doubt they will win, but they will come a lot closer than we were last season.