Speaking of youngsters in the perspective of the topic (we had high hopes on him, he was a youth star and made some contribution for a youngster as well) I'd name Vladimir Weiss, who also made some appearences for City up to 2012, including official ones.
My forgotten XI consisting of ex-yongsters would be
Karius - Mears, Etuhu, Vidal, Taylor - Abdul Razak, Rabiot - Benali, Mak, Joan Roman - Nimely
Subs: Westwood, Veseli (red ****), Logan, McGivern, Clayton, Weiss, BWP
It's more about being forgotten as an ex-City player to make the starting XI in this version rather than football quality of players, alrtough I tried to put in my squad those who had prospects in City and/or were good players then (or are now), and, at the same time, are now rather forgotten by us/forgotten they've ever played for City.
P.S. I must've forgotten somebody forgotten as the thread calls up for the players who are forgotten, so the paradox still takes place as it was mentioned on the 1st page.
Current players who we've been forgotten a bit (some of you may have not heard of them before and some may not consider them as our current players).
Wright, Nwakali, Brattan, Bossaerts, Zuculini - Ntcham, Caseres, Nasri - KDB, Barker, Jovetic
Subs: Yeboah, Agyepong, Naah, E. Agyri, Bismark-Boateng, Caseres, Lejeune, Sobrino, Glendon, Smith-Brown, Bytyqi