You're not referring to translating athleticism - you're talking about translating discrete skills. Those are two very different things. You're right that his particular skills from wrestling would not translate as cleanly to disc golf, though I'd argue that anything leveraging leg strength to generate power through the upper body would translate well. Beyond that - the general hand-eye coordination and practice habits developed through elite athletic competition would also translate VERY well between elite level wrestling and disc golf. Outside of that - we're referring to his clearly top-level athleticism which translates just as well as anyone.
As for Avery - we're talking about a World Champ with a number of Major victories. So his fitness has translated well. But what elite athletic background does he have outside of disc? You're comparing someone who is a big big man and extraordinarily fit to someone with elite athlete explosion. Avery clearly has high level explosion, as evidenced by his US distance championships and elite on-course distance... but there's no evidence that he's an elite athlete in terms of explosive power like a guy like Ben Askren. I don't recall his having any significant high school or collegiate level athletic career outside of this sport (which I don't think he took seriously until he got to his 20s or very late teens). He's a supremely fit and incredibly strong individual, but there's a difference between that and elite explosion.