Even if the grease fitting on the bottom of the ball joint did not slam up through the bottom and push the ball stud portion of the joint up (which it looks like in the picture to me) the castle nut looks like the threads got ripped out right under the threads of where the pin goes through, so for the love of god DO NOT try and reuse that ball joint, and in my opinion i would not reuse that control arm either. U just had a couple hundred pounds just drop on it basically, and that can tend to either crack or at least weaken steel, so if it were my car i would not trust that control arm what so ever, unless you only drive under 5 mph and less than 20 feet with that car