OK, 1 day left to answer question 5. So here are the clues so far, plus some extra help

• It is sports related sequence i.e. nothing to do with the names or geography or anything like that
• It's to do with NBA champions over the years

and the final clues

• it's chronological i.e. the correct answer is the last team to have achieved this specific feat
• The answer is a team that already appears in the sequence (that cuts it down to 8 possible answers)

@ablaze @adhammer @chapelle