An ill prepared Louis, shipped countless right hands before succumbing to Schmeling after 11+ long rounds. It took over 15 years, for Marciano to duplicate this feat, when Joe was finished. Even then he didn't go down easily. In between these 2 losses, he did go down, but they were, knockdowns, not knockouts! Over 17 years against opponents of all shapes and sizes, 2 knockout defeats against renowned punchers in fights lasting just under 12 and 8 rounds, the latter when he was a shell, does not indicate a lack of resilience. Oh, almost forgot the question! Well we all know what happened to a prime Lewis in his 2 losing fights, he lost both via one punch. in a combined total of under 7 rounds. Added to this Lennox, enjoyed physical advantages in many of his fights, while the much smaller Joe, often fought bigger opponents. Just can't shake off that image of Lewis knocked out in that South African ring, after insisting that complacency would never happen again after the McCall stoppage loss. After all, it was his decision to do a cameo in "Ocean's 11", not Rahman's! Lewis would probably be too big for Joe, in a dream fight. As to chin, as I said, it took numerous punches to stop a pre and past prime Louis inside 20 combined rounds, while it took only 2 to stop a prime Lennox inside a combined 7. Too simple an equation, perhaps, but that's what happened.