Add the following:
Numerical equivalent of the first letter of the first person to attempt Stage 2 in Vegas first name
Number of Stage 3 competitors in SASUKE 12
Starting number of the first person to clear the Chain Reaction
The age at the time of competition for the last competitor to fail the Body Prop in SASUKE
The total number of times the Floating Boards have been cleared in American Ninja Warrior
The highest number of consecutive SASUKE tournaments the Rumbling Dice has appeared
The lowest starting number ever worn by the most recent two-time finalist

Divide by:
The number of people to clear the Curtain Cling in its third tournament

The answer is:
The name and tournament of the first SASUKE competitor to clear Stage 1 wearing that number