"Time" in FST

in order to understand how there is no time in the FST, does it make sense if i think that when jack was in the FST, time was moving slowly and when Kate died and went to the afterlife it moved much faster? i believe that they all went to "nirvana" together so if jack died before kate, are there multiple FST for each character when they die? i don't want to believe that there are mulitple ones, but how did Juliet skip her whole FST conversations with sun and jin and start saying what she was talking to sawyer about when she died after jughead? please expain

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