I really wish they had done more with this storyline. Personally I didn't like Kane as much when he removed the mask. The imposter resembled the Kane character from my childhood and I was rooting for him.
I can tell the WWE didn't know what to do with the Kane and Big Show characters at times. There were times when they seemed invincible but other times when they seemed too weak. Its tough to utilize big guys because you want them to be a huge dominant threat but they need flaws too.
But I DID enjoy this storyline. But unfortunately it was over as soon as it started. If this were done during the Attitude era it would have been stretched out for a while and done right. Kane would have feuded with his imposter for a short series of PPV specials probably