A minor quibble. The disciples could not have understood, from Mt. 28.19-20, any command to disciple gentiles. Instead, they more likely thought of the Jewish diaspora as a target for discipleship. The inclusion of gentiles as co-heirs was probably "unbearable" (John 16.12). The Spirit indwelling Cornelius was the signal they conceptualized as indicating acceptance of this class of peoples. John 16.13 then anticipates this fulfillment.
A minor quibble. The disciples could not have understood, from Mt. 28.19-20, any command to disciple gentiles. Instead, they more likely thought of the Jewish diaspora as a target for discipleship. The inclusion of gentiles as co-heirs was probably "unbearable" (John 16.12). The Spirit indwelling Cornelius was the signal they conceptualized as indicating acceptance of this class of peoples. John 16.13 then anticipates this fulfillment.