Yes, of course bin Ladin wants to destroy Saddam and Saddam eventually wants to destroy bin Ladin. Just like Shia Iran wants to rule with their Shiite Velayet-e-Faqih (rule by clerics) and the Muslim Brotherhood ideology promotes a Sunni Islamic caliphate (quite different than the Shia version). While normal Sunni and Shia may not have inimitable hate for one another, Sunni and Shia leadership do. But they will work together in hopes that the short-term goals will give them the edge in the long-run.
If this gulf can be crossed, we have to at least keep within imaginibility that there can be short-term alliances between secular Sunni and Islamist Sunni. To do otherwise would be a catastrophic "failure of imagination."