People know Lebron isn't a professional fighter,...right? This makes about as much sense as Lebron choosing to play a pickup game of basketball against a fighter to make some nonsense macho point that's meaningless because you know,...the guy isn't a professional basketball player.
Or better yet, in the same vein as maybe we should get Magnus Carlsen to play a game of chess against Covington to prove how stupid Covington is. It would be nonsensical and unfair, and It would make about as much sense. (Although Covington really is pretty stupid.)
It must be said that in an alternative universe where instead of basketball Lebron trains his entire life be in MMA and works as hard as he's worked on basketball he probably turns Covington into a pile of goo in the middle of the octagon. Adjusting their weight class to be the same and the result would still be similar. If Covington trained his entire life to play basketball and he was magically made over six and half feet ball he probably tops out as a mid-tier collage backup.