I just realized that the whole Rotta Desilijic Tiure business has hit at least one canonicity snag. In his last will and testament, Jabba claimed to have no offspring.

The Hutt deal plot makes sense somewhat, at least in the context of what has been revealed so far. It more or less appears to be "You give me my offspring, I don't have Cartel ships blast you out of space while in their shipping lanes". Even the Jedi have to bow down a bit during the pressure of war.