hmm that is an interesing one, only other place maybe oil could seep though is the valve seals, unless the gasket went internally if from an oil passageway to the bores.. which is nigh impossible, but u never know.. is ur turbo ok? then again it cant be that much oil has passed through the piping..
is the head ok? ie uncracked etc, but still very hard to get what ur discribing...
wait a sec just thought of something, if one of ur rings is stuck, ull still have good compression, BUT oil will pass through.. as the oil scraper (bottom ring) is the one which doesnt allow oil to pass up, it doesnt affect in a compression test..
kon