Yes Drew, I am very serious. LeBron James is indeed a proven big time closer; a bigger and better closer than Dwyane Wade for that matter. I do not know if you are big on stats, but here are some stats if you are interested:
http://www.82games.com/CSORT11.HTM
The reason why he has not had game winners and all that stuff is because the Cavs have not needed them much. They have been taking care of business with teams that they are supposed to beat, so he does not need to be hitting buzzer beaters. Now I am not comparing his clutchness to Kobe Bryant (Kobe Bryant is better in that category of course), but as an example, Kobe did hit so many clutch game winners this past season. But they were against teams like the Raptors, the Bucks, the Heat, etc. The Cavs took care of business and always had a comfortable lead playing with the teams they are supposed to beat, so LeBron has not had much need to be a "closer." It is also worth mentioning that that "monster game against Detroit" cannot be overlooked like that. In fact, I think TNT called it the greatest playoff performance of the decade (and one of the best in NBA history).
I also do not think he gave up in the playoffs last year. The Magic were just a better team than the Cavs and they defeated them. It was not a surprise or an upsetting series. The Magic beat them quite handily and confidently in the regular season games they played that season, and in the only game the Magic lost to them that season, the referee made a questionable call. They had nobody to guard Dwight Howard, Rashard Lewis, and Hedo Turkoglu that time. LeBron was the best player in that series but the Magic were a better team.
I am calling the Chicago Bulls a championship contender now because of the addition of Carlos Boozer (he will give them a good low & high post player) and the much needed bulls eye shooter that can stretch the floor in Kyle Korver. Furthermore, they have one of the league's best point guard in Derrick Rose and one of the league's leading rebounder in Joakim Noah. If I am not mistaken, Carlos Boozer and Joakim Noah are among the top 10 rebounders in the league. They have also employed Tom Thibodeau as their head coach: he was the brain behind the suffocating Boston Celtics defense (best in the NBA to me). What more could you ask from a championship contending team? And let me note that I called the Bulls of now (after free agency) a championship contender and not the Bulls of last season. That being said, although the Bulls of last season looked bad, the injuries that they had really affected their seeding. Barring injuries last season, I think they should have been a legit #5 seed. They were a better team than the Heat.
Sorry, I cannot throw in the Nuggets, Jazz, Thunder & Suns as contenders. The Mavs highly disappointed last season by losing in the first round. The scores of the 6 games in that series (except game 1) really does not indicate how much the Spurs punked and upset them. The Nuggets are not yet ready too -- K-Mart's knee is wearing out (I think) -- they were also first round losers in the playoffs to an injury riddled & shorthanded Jazz team. They just are never focused enough in a series to win. The Thunder are far from a championship team (yet), they do not have a true center and power forward. The Suns overachieved in my opinion last season; do not expect the same miracle from them next season.
For the so called "doubters" doubting this new Miami team and how they will put it together, I wonder why. KG, PP & Ray Allen were able to do it. There is no reason that LeBron, D-Wade & CB4 cannot do it.
***I thought I would mention that what I said about the Bulls is based on what things look like on paper. Nobody knows how things will play out on the court in sports.
It is better to try and fail than to fail to try.