As I said in the other thread, my main issue is that this has been tried with Chris and it fell flat because we as readers did not get to see the character grow, and, unlike Damian, the Robin's, Kon, and the TT or YJ crew where they took the time to nurture friendships and allowed them to be kids, Jon being aged up means we do not have that same connection.
Its because we grew up with TT or YJ that we can connect to them. Taking that from Jon is one of the worst moves they can make.