The thing is that the fact that we have a corpse that looks like the oracle now does not mean that the oracle was not Jafar before. This body could easily be a distraction, after Jafar has decided that his disguise and relationship with Jasmine now has no value and he wants to return to his own agenda.
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“The truth isn't easily pinned to a page. In the bathtub of history the truth is harder to hold than the soap and much more difficult to find.” - Terry Pratchett