Anyone who wrestled will tell you that, while there are compatible skillsets, being a good wrestler doesn't by definition make you a good football player. Obviously a few things translate, but it's not even the same mindset.
Does being a wrestler make you better at recovering from being cut block? Absolutely. Kick the legs, drop the hands and go. Does being a good wrestler make you tough? Absolutely. Hardest workout there is in sports.
But you don't just switch. Micah Parsons is Gable's biggest fanboy, and Micah would get dominated by Wisconsin's #3 HWT if such a job even exists. Conversely, Gable transferring to the NFL would be multiple years on the practice squad. Similar routines aren't the same and, while Gable has a preternatural sense of balance and really fast feet, there just isn't a huge market in the NFL for 5'11", 260 pound defense ends. Could he maybe go the undersized, 3 tech route? Maaaaybe. After a few years. But meanwhile he'd be missing on millions of WWE or UFC money. Dude is built to wrestle. He's the single best HWT wrestling talent this country has produced in a generation, maybe longer. Maybe ever.
Trying to square peg him into a round NFL hole would be doing a massive disservice.