Are there any POWs who witnessed his being tortured at all?////
According to COL Hackworth who looked into it, no. Hack wrote a column stating all we know about POW juan are his accounts. No corroboration.
Google Hackworth.
Just refusing to treat his injuries could be construed as a form of “torture” but there’s no evidence of him ever being waterboarded but, then again, a radio disc jockey was, himself, waterboarded on the air to prove that it could be survived and wasn’t that bad.