I guess his agents were working it to the max.
Aimar it's the only one that has some atributes similar to Diego, yet not close, even in the physical department. Yet el payaso was kind of the link between Diego and Lio.
Ortega was trully strong, short, amazing dribbling, but not close in pace, in intelligence and sadly a bit of a wino. Yet Orteguita for someone taht barely trained, that has his vices, was always fit and strong as fvck (this doesn't mean with the proper stamina), I've never seen him chubby.
Riquelme was the best example of what I've said before, he at some point became the new 10, but couldn't be more diffrenet than Diego in his physique and style. No one saw a Diego in him, spme sort of replica.
PD: technically also, no matter how great a Roman, Aimar, Ortega could be , Diego and Messi are on another level.