Isaac, did I say that Miami were going to win?
What I meant was, everyone acted like Lebron was going to single handedly win them a championship.
Just look at this text from this link:
"Without James, the Cavaliers are as unpalatable as the toxic mixture that once caused the Cuyahoga River to catch fire. With him leading the way, they have won 66 and 61 games -- the most in the NBA -- in the last two regular seasons. Without him, they'll be lucky to win 60 games total over the next three seasons."
That pretty much sums it up - they didn't have an "our team can win" attitude, they had a "LBJ will win it for us".
I don't know what kind of team Miami will have, no one does yet; I'm simply saying that one player doesn't win a title, a team does. The Cavs, despite their regular season records, were not winning teams.
The regular season record can hide bad coaching decisions, or matchups not in your favour, and since you're playing a different team every night, your opposition may not have completely prepared for you.