Mbappe was never really available he wanted to go to psg, Madrid try & didn't bet him, dembele was the best young talent in the world not name mbappe at that time, which was not available, if he was available we all would want him. It doesn't take a rocket scientist to see who was going to be the better player.
No one wanted to pay more than 100m because we all knew he wasn't valued that high but due to Neymar leaving us will little time to react & 220 burning in our pocket durtmond was always going to take us for every we got, which they did, it was a seller's market at that point.
As someone said we could have bought him before he want to durtmond as we apparently had eyes on him, but Barca being Barca we had to wait until he went somewhere else and proved himself.
The signing was the one available & that everyone wanted, he was one of the most sort after young player in the world not name mbappe at the time & he only wanted to play for us.
The fact that he could only manage 74 games for us in his time here requires a proper deep dive by the powers that be.
Coutinho was always a big IF tho, griezmann was also a big IF, which is why for me those 2 are bigger waste than dembele because from the jump there fit was highly questionable.