You make it seem like Kim has no mental toughness or pride. DHK was doing high level grueling Judo since he was a child, than joined the Korean marines, than became an mma fighter(was fighting but living off one cup of ramen a day in his own words)
not to mention the exact reason Siyar will lose is why you think he will win. Siyar can only really generate power going backwards just like Paulo. Going forward he is really flat footed and slow.
Hence Kim is going to wait for Siyar to strike first just like he did Paulo before going for the takedowns.
I give Siyar 5 percent chance to win with some lucky punch. but other than that he is going to get dominated. Have no idea why Siyar is even fighting Kim to be honest.