That talk about "aura" is mostly BS and often used to downplay Silva's opponents.
It's once they felt Silva's movement, skill and remarkable strenght and chin that they were at a mental dissadvantage.
People often point to the Okami and Griffin fights.
They both started as focused as you can get, just like in any other fight if not more. It was at a certain point during the fight (Okami when got shut down in the clinch, Griffin when got dropped with a punch that didnt even see coming) that they started to feel hopeles and their body language, their resolution, changes drastically, but it happened DURING the fight, not BEFORE because of aura or some BS like that