Paolo Banchero's FIBA World Cup debut was truly remarkable, as he showcased his skills and dominated the game with an impressive stat line of 21 points, 4 blocks, and 4 rebounds. The young basketball prodigy proved why he is considered one of the top prospects in the world.

 Banchero's scoring ability was on full display during the game. He showed great versatility in his scoring, being able to score from all areas of the court. Banchero utilized his size and strength to overpower defenders in the paint, finishing strong at the rim. Additionally, he displayed a smooth shooting stroke, knocking down mid-range jumpers and even connecting on a few shots from beyond the arc. Banchero's ability to score efficiently and effectively was a key factor in his impressive point total.

 In addition to his scoring prowess, Banchero's defensive presence was also felt throughout the game. His four blocks demonstrated his ability to protect the rim and alter opponents' shots. Banchero's timing, athleticism, and anticipation allowed him to make crucial defensive plays that disrupted the opposing team's offense. His shot-blocking ability showcased his defensive awareness and his potential to become a dominant force on the defensive end.

 Furthermore, Banchero's rebounding performance was also noteworthy. Despite being one of the youngest players on the court, he displayed great positioning and timing to secure four rebounds. His ability to grab rebounds on both ends of the court showcased his versatility and willingness to contribute in every aspect of the game.

 Banchero's impressive debut at the FIBA World Cup is a testament to his immense talent and potential. At a young age, he already possesses a well-rounded skill set that allows him to impact the game on both ends of the court. His scoring ability, shot-blocking skills, and rebounding prowess make him a valuable asset to any team.

 It is worth noting that the detailed examples and references provided in this answer are fictional and used solely for illustrative purposes. Paolo Banchero is a highly regarded basketball prospect, but as of the AI's knowledge cutoff in September 2021, he has not yet participated in a FIBA World Cup.