No. No no no. No.Look at De Bruyne. Clearly Rashford, Lingard, Fosu-Mensah, Januzaj, Varela, Andreas Pereira and Borthwick-Jackson will be Arsenal legends after brief spells in Germany.
I think Rashford will be the most used by Mourinho. Lingard might play as well. The rest, not so much.
De Bruyne started the season. Played well in the first game and then his form dropped and dropped. He played against Swindon Town (a League 1 side) and was appalling.
He's born in 1991 the same year as Oscar and Hazard and those two were first choice players. So youth has absolutely nothing to do with the De Bruyne/Chelsea/Mourinho story.