Re: CrossFitters vs Decathletes
You actually have examples on the women's side of things.
Iceland Annie.... polevaulter.... never did much of any of the exercises. Was in 1st or 2nd until she got dropped by the muscle ups.
Lindsay smith.... decathlete.... never did CF until regionals last year. Made top 5.
Elite athletes would tear up the games pretty much... especially with specific training.
+ superior genetics.
As the stakes rise for the games (aka monetary prize for placing) you'll likely see more and more elite or former elite athletes trying to enter.