Is pretty much the correct answer.
When you look at teams from 3/4 years ago and compare it to this one, it’s frightening.
The thing is we signed top proven quality a few years ago that most top teams were after. John Stones, Kev, Walker, Rodri, Gundo, Mahrez, Sane, Sterling, Aguero, Eddie, probably some I might have missed. It's probably also worth noting that Stones and Rodri, even Gundo didn't exactly rip up any trees when they first arrived and indeed were being talked about as major failures. Gundo was injured for ages and slow, Rodri was also deemed too slow and Stones error ridden.
We have signed potential, some may make it some might not. Reijnders being the top one, who was player of the season in Italy. The big problem we have is that we allowed too many players to grow old together so we are now trying to rebuild half a team and that's going to take time.
Short term we desperately need a right back and if Eddie goes a top.keeper. Trafford may make it but right now he looks about 2-3 years from doing so, if he ever does. Ortega has to come in if we can't get one or persuade Eddie to stay. We aren't getting anybody as good with their feet as Eddie so we can forget that.
I'd add a top center half to that list, a leader and organiser but who??
Rodri coming back at the level he was and staying fit will improve us defensively but no guarantees he will. We might have to suffer some short term pain before we get it right. A classic example of resting on our laurels, similar to the rags which ended their time at the top.