Martin,
Good posting, very considerate too.
There are some (many) things that remain un-asked and/or un-answered. As an egsample;
Assuming that the aircraft collided at an intersection of two airways, that intersection probably has a name or a fix associatedwith it. Were there any estimates passed for that position, and if so, how far apart were the estimates?
Was the ATC on duty starting a night shift, or ending an afternoon shift? How many continuous hours had he been on duty? In fact, how are the shifts arranged at Zurich ACC?
Statements made to the press seem to imply that these 2 ATC's were the only guys on duty at the Entire Zurich ACC, and one of them was on a break. Is this accurate? The entire Zurich ACC, ONE CONTROLLER ??
If there are any Zurich ATC's out there, could you (without incriminating yourselves) fill in any of these type of "Procedural" details.
Cya