This is a good read one game winning shots over the last 3 years: http://82games.com/gamewinningshots.htm
Iguodala does pretty well for a non-shooter but nothing stellar. In fact the only players who hit these shots at a high percentage are the pure shooters- who often have someone else set them up.
And Ricky, He may have had 5 TO'slast night, but Iguodala averages nearly 2:1 A/TO as a SF who gets 5.3 assists per game. Of all non-PG's who average 5+ assists only a a handful are better than 2:1 (Lebron, DWade, TMac, Roy and Joe Johnson.) Those elite players range from 2.1-2.5. Every other non-PG with high assist numbers is worse than Iguodala.
Is Kobe a TO machine? He had 4.9A/2.6TO's this year.
I think you're misinterpreting those stats. Yes, other players have made more, and also attempted a lot more. You should look at shooting percentage in those end of game situations. Also, I don't like their methodology. I want it to be last shot in game winning situations- you make it your team wins, you miss and your team losses or goes to OT.
At any rate Iguodala really does outshine Kobe and LeBron in terms of shooting percentage, at least so far. If he keeps doing it, he really will deserve the moniker, B.O.S. There is also a sublist, for playoff last shots, and in that we know Andre is 1 for 1 so far, and I have the feeling he'll be in that situation again before the playoffs are over.
Kobe handles the ball a very high percentage of the time for the Lakers, and players who play like that put the ball at risk quite often. Put it this way, Andre is better with the ball than Kobe. The only thing Kobe does is shoot it more, he shoots for a lower percentage, doesn't rebound as much and doesn't pass out assists as much. The Lakers depend much more on Kobe for points than the Sixers do with Andre. There are few teams with as many scorers as the Sixers.
There's also a link from the same page that allows you to see how well the players do with 5 min left. in a game. Interestingly, Dalembert is #2 for shooting percentage (regular 2 pts.) and Speights is #7 just ahead of Mr. Garnett. There's a good reason for playing Speights, he's good in crunch time.