Lucky? A knockout in the first fight, then dominance in fight 2, leading to a leg check that resulted in a fight-ending injury. You don't beat someone twice because you're lucky.
I still don't think he's as good as Silva but it's more like Silva is past his prime. Hopefully this isn't the end of Silva's career, but it wouldn't shock anyone. What would look like (and how old would he be) by the time he got back to fighting shape...