Both. He intended to check the kick in a destructive way. Thereafter...how effective a particular technique is depends on so many factors that the outcome is not in anyone's full control really. Even the most controlling submission can move or fall a certain way that results in unexpected results. We've all seen jabs that landed really well and resulted in a knockdown and a full blooded right cross that didn't.
The destruction came about because Silva didn't turn his hip over - the check itself is ridiculously painful, but breaks are not common with it without the other party "contributing" towards it
Tell me about it. I'd rather take a bollock shot. Once managed to do simultaneous roundhouses in sparring and collided shins. Bloody awful!