He very well could’ve been...I only know of Grand Master Shimabuku who I met once in Knoxville, Tn...
Watched him burst a floating balloon with his “shuto” jab...
Most people think stories like that are just fantasy.
BUT...... the tiny PISTOL SHRIMP can snap his claws and shoot a bubble of air at 62 mph which heats up to 4700 Degrees Centigrade . The bursting bubble makes a sound that reaches 218 Decibels (louder than a shotgun).
If a 2 inch shrimp can do all that, then a Grand Master can likely do many fantastic things.