This question I posed in another forum and never had a definitive answer:-
If, when you start the Morrowind MQ and ignore dear old Casius, go straight to do the backpath MQ (kill Vivec and equip the false Wraithguard etc.), will he still be waiting semi naked in his house in Balmora?
Would it be possible then to go see him, deliver the package and do some of his quests?
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Experience is simply the name we give our mistakes
Still doesn't answer the question about Caisus. I suspect he just sits around patiently waiting for the PC to turn up. Perhaps I should feel guilty suggesting he should be stopped from returning to his family and helping in the Imperial City.
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Experience is simply the name we give our mistakes