So the bird was bought at 2 months old. My brother in law says that the petshop took him to the back to have the wings clipped just before purchase and he didn't see if the bird had inner wing feathers.
So we don't really know if the bird even had the inner wings to begin with.
He has taken the bird to a different petshop since then and they informed him that "the bone is has dried up"
That sounds absurd to me. So I'm just checking with other owners if missing inner wing feathers is normal or what exactly could be the case...
Welcome to the forum! I would go to an actual avian vet to see what is going on with the flight feathers or lack of them. I don't have a lot of confidence in pet shops diagnosing bird medical problems. My 14 year old grey, Sheeba has never tried to fly, and is missing a few flight feathers on both wings. She has never had them clipped in the last 6 years, so she obviously has a problem with feathers that won't grow back. She gets along fine, and it probably disturbs me more than it does her.
I would love to see her fly. But to be sure about your bird, see a vet.