The safe pick for breakout teenager of the tournament is Yamal, and the safe pick is correct, and the safe pick is also boring. The interesting pick is the one the difficulty model rates with the highest ceiling and the lowest certainty, the player who could either define the World Cup or watch it from the bench in a tracksuit.
That player is Estêvão, and the reason he is interesting is the same reason he is risky.
The output that earned the ranking
Estêvão scored five goals in four Brazil starts between September and November, and three in five Champions League appearances in his debut European season. The Premier League numbers were thinner, which the potential models read as a warning sign and the difficulty model reads as noise, because the difficulty model does not care about volume. It cares about type.
His goals are contested dribbles into the box finished under pressure. Not the cut-in-and-curl from open space, but the carry through traffic that ends with a finish taken while a defender is making contact and the keeper is closing the angle.
The hamstring is the whole story
Estêvão has been carrying hamstring trouble. He was left out of Brazil's March friendlies because of it, and reporting through the spring described him as a genuine doubt for the tournament before the latest expectation that he should be fit to feature.
Hamstring injuries and explosive teenage wingers are a bad combination, because the explosive acceleration that produces his high-difficulty goals is the exact movement that re-injures hamstrings. A half-fit Estêvão is not a slightly worse Estêvão. He is a different and far easier player.
Why Brazil makes the bet sharper
Brazil does not ease teenagers in. They identify a new attacking talisman and they hand him the stage, which means Estêvão will not be managed cautiously into the tournament. If Ancelotti starts him, he starts him to create, in the contested final-third situations where his difficulty score is highest and his hamstring is most exposed.
The pick, stated plainly
If Estêvão is fully fit, the difficulty model says he, not Yamal, produces the single hardest goal scored by a teenager at this World Cup. Yamal is the most likely to produce a great tournament. Estêvão is the most likely to produce the single greatest moment, conditional on a hamstring holding that has not held all spring.