Sounds like the LATCC ATCO had STCA and the aircraft were under the control of another ATC agency who did not have STCA.
How could the LATCC ATCO be faulted for not telling the other ? Did he know the other did not have STCA ? Who decided that the other unit did not need STCA ? I suppose the LATCC ATCO was just sitting watching the world go by ...... NOT !!
You need to be a bit more detailed Sir Fly to get a more reasoned response.