I've seen a few supposed hybrid greys before.
All of them have looked mostly like congo greys. One was a very dark color, but otherwise appeared only CAG. Bright red tail, larger body, all black beak. The only difference was a slightly darker body and CAGs come in varying degrees of color as it is.
I recently saw a picture of one that actually looks like a mix of congo and timneh, but the owner didn't answer me when I asked if she was a hybrid.
You can see mixed beak and a mix tail.
All of them have looked mostly like congo greys. One was a very dark color, but otherwise appeared only CAG. Bright red tail, larger body, all black beak. The only difference was a slightly darker body and CAGs come in varying degrees of color as it is.
I recently saw a picture of one that actually looks like a mix of congo and timneh, but the owner didn't answer me when I asked if she was a hybrid.
You can see mixed beak and a mix tail.