The evolution of MMA at heavyweight isn't near what it is at other weight classes. But then again, I think about Cormier getting beat by Stipe 2 out of 3 times and I DO think that LHW has evolved greatly yet Cormier was the 2nd best all time at LHW so those two narrative sort of contradict one another don't they..hmmm. Maybe its not that HW's haven't evolved as much as the fact that pure brawn presents more of an equalizing factor at HW than the other weight classes, partially due to the fact that there's potential for more weight disparity...and when Derrick Lewis counters world class Ju-Jitsu with 'just get up' technique, it gives the appearance that there's less technique at HW.
Its all so confusing. At the end of the day, I feel like Fedor's style would present a lot of problems for Stipe if he fought smart. His boxing was unorthodox and I think it would throw Stipe off. It would be very interesting to see how Fedor's Sambo matched up with Stipe's wrestling.