It seems to be the standard question when people make these sort of points. We can only point to what's missing in the team. Like many of us would have said last season, we need a dominant defender - we picked up Matip on a free, not someone many of us would have called. There are players out there and we should have a world class scouting system. I like the look of the last at Torino, and Modi has recommended a few players of similar ilk - hard-working and goalscoring attackers.
How is that Ousmane Dembele getting on at Dortmund?
He seemed very highly rated.
That said, if you look at lists of the most highly rated strikers from previous years, there's more than a few that got a big move but didn't exactly set the world on fire, or fell off the radar.
Lacazette has been linked with big moves to every top club every year for the last three or four, but he's still at Lyon. Is he still ace?