I know he's done it before. It's more like a 96% of the time rule. Every once in a while, they want something different to happen after the match, but still want Kane to win. So he blows the ringposts beforehand.
"You gotta hate somebody before this is over. Them, me, it doesn't matter."
"Hate, who do I hate? You tell me."
"Who do you love?"
-Wintermute to Case in William Gibson's Neuromancer
IIRC, the knock on Gewirtz is that he's easily influenced by whoever the lead wrestler(s) is at the time. For example, Kevin Nash supposedly had a lot of influence over Gewirtz before he hurt himself again that last time.