Delusional, Mbappe and Haaland are generational talents like Messi, CR7, Zidane, Ronaldo (doesn't mean they are going to be that good but the talent is there).
Fati is not, maybe a world class talent like Sancho, Hazard...
You can't put Ronaldo and Zidane as same type of example as Messi and CR7
Players like Zidane separated themselves from the rest of their generation very late in their career, same with Ronaldo who was getting ruined by injuries.
The likes of Owen, Figo, Beckham, Rivaldo, Nedved & Henry were competing really hard with them and beating them in B'dor , both Ronaldo and Zidane combined a grand total of 3 B'dor , Messi and CR7 are likely to end with 4 times of that
This is where Messi and CR7 were special, they totally separated themselves from the rest of their generation.
Mpabbe and Halaand are yet to prove they are that separated from the rest of their generation, they might do it but it is still to be done.
I think it will be similar to pre-Messi/CR7 and the field will be closer to each other.
The likes of Fati/Sancho will be way closer to Halaand/Mpabbe than Iniesta/Lewa were closer to Messi/CR7.
All of that assuming health, which can destroy any career.
As for Fati, he finished 2nd in golden boy award in 2020 and 1st in fan voting, Barca fans seems to be the least excited fans about him for whatever reason