I don't have the answer to that, I didn't really see a lot of Leicester that season. I don't even think winning mentality exhibits itself that way. And when you mention Adebayor, he is a prime example of a player who didn't show a lot of traits connected to what I would call such mentality. Another one off the top of my head, were our own Jermaine Jenas. An exceptional talent (England's most promising youngster at the time, I recall having read), great athlete and nice guy, but seemingly happy just to go through the motion, earning a good living off football. More concerned with not doing something wrong than doing something right and not overly concerned with taking the next step.
Speaking of thropies, they are often won or lost on coincidences, luck and other factors. (Winning) mentality can be one of them, it's both a poor measure and easier extracted collectively in hindsight IMO. Whether you hit or miss a penalty can certainly be down to a mental thing, but whether you have a winning mentality or not doesn't matter much in my book. Noone likes to lose, noone chooses to hit the post or send the ball into row z, and nobody wants to end dead last in their division. But somebody has to. But as I said, I think that a team or group that has won a lot comes better prepared when facing certain situations, and are probably less error prone due to nerves and such. Mental traits I would rate higher, certainly when it comes down to winning the league rather than a cup though, are determination, cohesion and leadership. For all the good things with our present team, I still think we lack a leader. And he doesn't even have to be the best player, but HE has to have a "winning mentality" to kick some butts, the opposition's, the refs', and our own alike. I don't understand why captaincy sometimes seems given as a "reward". Probably putting my foot in my mouth, I'd rather have a great leader on the pitch than one on the bench. If we had a Keane or Vieira, I really think we would give City a run for the money, even this season.