Rolles is a family member and a 4th degree Black belt, the same grade as Royce was at when he won the first UFCs
Marius is a World Class strength athlete - for his cage prep he has focussed on Boxing and Kyukishin Karate, so has learnt how to functionalise his strength for combat
The breakdown in slo mo shows the perfect use of distance, timing, feint, jab, trap, and a big OH one punch KO
www.youtube.com/watch?v=UYfhMf4ULas
The First Rule is still, and always will be, LEARN TO HIT FUCKING HARD - even if you are fighting a GRACIE