I know we're all excited by how Nwaneri broke through, but there is no way Max Dowman will be ready for any significant minutes next season.
He's fucking 15, slender, and barely breaking into Arsenal U21 and England U17. He has played less than half the England youth games that Nwaneri has played, and hasn't played any England U19.
I'd even offer a bet that Vieira plays more significant minutes (PL games aside from last 5 of the season, FA Cup, and CL games that matter) than Dowman next year.