@Kronshi...welp...this is bad.
Strike one, poking at the never turn on them thing implying that she will
Strike two, basically saying that once the young gems learn everything from him and when she is no longer needed she will be disposable
Strike three, implying she isn't strong enough to teach them their powers correctly or if at all and thus making them weak or too easy to destroy in battle if a future one occurs.
I think we are about to see a hurt and angry Aqua....depression, searing loss mixed with multiple insults(even if not meant that way) and the poking at old emotional wounds is just a bad combo lol