"@philipat, it's not especially unusual for passengers to fail to make it to the gate and be offloaded. It happens all the time."
In my experience in Asia, that is a lot for a single flight. It may be nothing but it is important to know who they are, did they later collect their bags or just disappear etc. My point was that this was not, as the other poster suggested, just a case of "Check-in" no shows because their bags were checked and on board, but of course offloaded prior to departure. I also note that KUL is a great airport for making very short connections (As is SIN) which is why I use it a lot as the connex times to Europe are very good in both directions and I have never had a problem with bags not making the transit.