I'm actually warming to the idea of Lacazette if we can't bring anyone else in. The guy has an above average touch, pace to burn and is an excellent finisher. Would offer what Theo does in behind but would be much better when it comes to holding the ball up and bringing others into play.
We won't be getting Ibra, Cavani, Benzema, Lewandowski etc. so we should really consider players in the next tier as upgrading on Theo/Giroud is not as hard a task as some are making it out to be.