Saturday Mthiyane

Feral African who suffered extreme cognitive damage from starvation and physical damage and otherwise literally next to nothing is known about him.

Dina Sanichar

Again extreme cognitive damage from starvation

Feral children often not only lack basic social skills but also have trouble walking straight. It has been documented that Father Erhardt observed, “He cannot talk, and though undoubtedly 'Pagal' (imbecile or idiotic), still shows sign of reason, and sometimes actual shrewdness”

Marcos Pantoja

This one actually obliterates your argument. Not sure why you listed him.

Marcos' survival was possible thanks to the basic skills acquired in the previous phase of his abandonment, as well as his extraordinary natural intelligence. During his isolation, the child learned the noises of the animals with which he lived and used them to communicate with them.

Victor of Aveyron

Literally a deaf mute who was still found to have self awareness and taught himself how to cook vegetables before being captured.