Some great entries in this thread.

I’m not sure there can be a right or wrong answer here. Is this an inherited trait? I can’t even find a suitable definition other than that which seems to pop into all of our heads. @DavilaJones has a better definition then the dictionary. I thought of Jones immediately in respect to boxing. Like a third eye at work. As others have referred to there is something else with the elite of the elite in sports generally. How did Sanders read the field like he did and make those cuts? Freakin Matrix. Some of Gretzky’s passes were not humanly possible and he could put the puck dead to rights w/o a sound when it hit the stick. Jordan had something extra. And the guys like Martinez, Bo Jackson and Deion that made the elite level of two sports. I bet the Nfl teams are lining up to make a play for Bolt once he leaves track. Still some track super stars can’t catch a football. What of the decathletes? What if anything did Harry Wiley contribute to Robinson’s athleticism or Arcel to Duran or Benny Leonard?
How much does chemistry as in peds play a role? I know you asked for boxing related but it’s hard not to look at the question in a broader sense. I think the case could be made that it’s something you are born with on the most fundamental level. Perfected over time in the chosen sport by honing in on its specific requirements. Trouble is, the case can also be made that much of it can be learned like in the Hopkins example. Or say Goldman’s tutelage of Marciano. It’s a real brain tease.