Heroes/Icons who are still missing and need to be added to the game

Ask Uncle Google or Aunt ChatGPT, 

Platini was a part of a massive corruption scandal, which got him removed from UEFA (cleared now but, yeah...).
Robinho, Giggs, Overmars, Dani Alves - Google it and you will see why they either got booted from the game and why 1st one is still in prison, which clearly translates to why the chances of them becoming hero/icon are minimal. Terry wasn't as bad, but his antics put a similar light on it.

Some other players you listed:

- should be icons/heroes (e.g. David Villa)
- already are in PC/Console FC game (look it up)
- already are in FCM (e.g. Forlan)
- are already heroes/icons but are not in the current active roster (Di Stefano)
- recently retired (e.g. D Silva, Pepe), so getting an icon/hero like Pizzaro or Ibra is a matter of time
- EA lost or has no licensing rights to the players (Guardiola) or the still active high-profile players like Neymar, since he's in the Brazilian league, which is not in the game.
- political (e.g. Weah - President, Romario - Senator)
- and some are not good enough to be considered (bunch of the local, big names to CAF, so regional but largely unknown to the rest of the world).