This guy had a lot of muscle mass. There's a reason why when Free was the worst tackle in the league, all Parnell could do was get spot duty. I know Parnell is your pet cat, but he just isn't very good.
Mandarich would have looked more like Free after he had to quit the Steroids.
I would be OK if Free had a 1993 Nate Newton upper body if he that kind of strength.
Parnell was as good or better than Free when they split reps and in the 2 games that Parnell played at LT. It's on film
There were multiple reports that Callahan campaigned to bench Free and start Parnell. The compromise was having them split series. The next opportunity that Parnell would have to beat out Free was the following training camp; however, Parnell was injured for the duration of that preseason and the issue lingered into the regular season.
You have no idea or basis for your conclusion. I doubt if you even studied the game footage when Parnell did play.