I believe their criteria is based on "status" more than contributions to football.
Hazard was a legend & an icon for Chelsea but he flopped hard at Madrid.
He's loved mostly by Chelsea fans & respected by others but he's not idolised by other teams supporters.
I think, now that you mention criteria, that Luis Hernandez got an Icon card because he is seen as such by the Mexican fan base.
But I totally agree with Chicharito, probably should be one of the best Hero cards imo.
Maybe a good idea would be to have Hero & Icon cards for the same players, for example, some players were good but not great but then became great or vise versa, maybe different eras of their career should reflect that fact.
Instead of having base, mid, prime etc.
Imo Kompany should be an Icon, he's one of the best CBs in PL history, even if he did play for those sc*m bags. 🤣