Louis was ko'd by what were, in todays money, barely cruiserweights. Anyone who has read any thread on David Haye's heavyweight prospects will be well aware that it would therefore be impossible for him to beat any legitimate top ten modern heavyweight.
You can't compare eras for god's sake. A bum from today would K.O. Louis, doesn't mean he wasn't a great.
Lennox weighed 248 pounds against Vitali, in his second to last fight, Louis weight 203 pounds against Jimmy Bivens. Lewis, KO.
If they fought in same era the sizedif would not have been that big=Louis ko.' In 200 years Valuev might be mv.