Time travel movie. Doesn't matter who got snapped when we have no context.

Do I think it's anyone but Steve? Likely no. But it's a possibility and there is literally no way anyone save the Russo Brothers can prove or disprove at this point. I'm not ruling anything out. I'm having fun and not looking to have a deep forensic dive into the exact percentages of the possibility it's Bucky with his arm restored or Quill or anyone else not Steve. It's probably Steve.