Your whole question is a red herring as athletes will always concentrate on the training that best focuses on the attributes they need. and many sports rely on different attributes.
Point is, how would Lebron do at Jockeying? Tennis? Sports racing? Figure skating?
Comparing GOATs is almost pointless.
If we're really going down the road of impact of the player/physicality/needed physical attributes specifically in a team sport, the field will be cut down to only a few sports that aligns the most of these attributes, like hockey, basketball, football, rugby and soccer.
Now out of all of these, basketball aligns the most of the attributes as the limited rosters makes it natural that a single player can completely change the game at a higher degree than the other sports mentioned, while playing both sides of the game, physically abd directly battling opponents (more in MJ's time though, I concede in advance, same for hockey). Each of these sports also have different eras that had very different set-ups, whivh further muddies the water.