For the sake of comparison, Iguodala, for the same # of years, will earn:
2011-12: $13,531,750
2012-13: $14,718,250
2013-14: $15,904,750 *ETO*
2014-15: UFA
The Clips, who are actively looking for a SF vet, were offering a package centered around Kaman (an expiring contract mind you) for a player slated to earn MORE money per year over the same term. It was Philly, not the Clips, that balked.
Now is Iggy 4-5M "better" than RJ? We can debate that, but I will note this: Iggy was the best scorer on a crap team for a LONG time. My sense is that he'd only be marginally better than RJ in the Spurs system. Put differently, given the right system RJ could be a good (and cheaper) fit on the Clips.
As for Kaman, if he can regain his confidence post injury he would be a solid fit for the Spurs. If he doesn't pan out, well he's off the books in a year anyway (at the same time as TD)... Oh, and by moving RJ you can make a compelling case to a free agent SF (I like Prince) that if he signs with the Spurs the SF position is essential his for the taking...