So your point was that Parris wouldn't be in the position of possibly winning the triple-crown (HS title, NCAA title & World title) if Gable had not retired.
OK, but you compared his NCAA title to Micic avoiding the process of making the US team. Which are two totally different things. Micic had the choice of attempting to make the US team or the Serbian team. He choose the easier of the two. Not faulting him, as I have already said most would do the same. Intelligent people succeed by taking advantage of the oppotunities afforded to them. Parris didn't choose to avoid Gable. Was he fortunate that Gable retired? Absolutely, but it is no different than had Gable graduated.
But most important here is that once Gable was out of the way, Parris got it done. Micic never had a generational talent like Gable in his way in college, yet he never managed to win a title. He had a very nice college career & lost to some very good wrestlers but noone with the pedigree of Gable. Gable won an Olympic title at the age of 21, beating a legendary multi-time world champ in the process.