Well yeah, that's Levy. I think he probably thought he was making a stand against City's tactics, and he probably felt he'd 'won' when the transfer window shut. But I believe the reports of Levy not even negotiating only came out with like a week left. City didn't exactly leave us much time to get a replacement.
But the other facts were he had 3 years left, had just been the league's top scorer + assister, hadn't had injury issues all season, is still only in his twenties for a CF, and is the star man + figurehead of the club. So we were entitled as a club to expect a fair fee, something higher than City paid for a 25 year old creative player who was barely in the England side yet.
My biggest gripe would be whether he was refusing to properly negotiate from the start, which wouldn't surprise me at all. If he had it in his head he was going to keep Kane regardless, then he's properly screwed us.