I don't even know if what happened to San Antonio in Game 6 even qualifies as a "choke." A five-point lead really isn't all that big, even with under 30 seconds to play. A couple of three-pointers sandwiched around a free throw- that's all it is. Not much. And it isn't as if the Spurs did anything egregious in that stretch. They missed a couple of free throws but there were no awful turnovers, no Nick Anderson-type meltdowns at the line- they failed to grab a couple of rebounds and Miami hit a couple of big shots. Earlier this season the Cavaliers had a four-point lead on the Celtics with ten seconds left and wound up losing when they gave up an and-one, failed to secure the rebound off the missed free throw and Avery Bradley hit a three-pointer at the buzzer. Things like that happen sometimes in basketball.
What doesn't happen is a 73-win team blowing a 3-1 lead while losing its last two games at home. That's almost impossible to comprehend. I'd like to believe the Cavaliers won it more than the Warriors lost it, but when you lose a series like that, under those cir stances, that's a choke for the ages.