LeBron James took 59 free throws in the Detroit series. If the Cavaliers get to the Finals, the first two games will be in Cleveland, and LeBron will get LeWhistles. L.A. indeed has an advantage in the frontcourt, but that advantage won't do them any good if their bigs are in foul trouble, which they very well might be in both games.
Another thing: L.A. has to at least split the first two games in Cleveland. If they go down 0-2, they're finished. They don't have the heart to come back from an 0-2 deficit.