Kinda reminds of how Charles looked after beating Louis. This content is protected I don't think anyone has ever looked great after being in the ring with JL.
Not disrespectful to say if a still respectable but far from prime Louis busted him up like that the guy that destroyed a Max Baer could have hurt the Rock.
For Marciano at that time, yes. Underdog, smaller man, far less experienced. It was only a non title eliminator. I think Dempsey, Louis and Marciano's successor Patterson won the world championship with opponents no better than the 1951 Louis. It was a solid step in Marciano's career. If we talk about the truly great all time heavyweight wins, it probably doesn't rank. But that list would be a very short one anyway.