I think age is also a factor. The top D1 guys tend to stick around freestyle longer, maybe a year or two longer then they should because they hold on to that Olympic/World dream. By the time they jump into MMA, it would naturally be more difficult because you missed out on the training while still focused on your other goal. I saw Chael Sonnen even talking about Gable Steveson's MMA chatter and recognizing at 24, he's actually near the end where he need to either start training now or it isn't going to happen successfully if the clock keeps ticking. A lot of the wrestlers that are doing well, D2, D3 guys, etc, didn't stick around freestyle after college, they jumped into the next venture. So it's the younger wrestlers without the college accolades doing well, and the older guys, who were actually better on the mat, often not living up to the hype. If the top guys jumped right in after college, I think they'd do the as well or better than the D2, D3, but they just have other goals at that age.