Thanks FoolTrottel, your info was helpful!
As additional folowup on this post, this is what I've discovered.
With;
autoLogDetail=0, a player casualty message will still be displayed, but not the stat messages crediting the kill.
autoLogDetail=1 and 2, if the player is flying as a gunner, in coop, when KIA, only a casualty message will be displayed? Otherwise crediting messages are displayed, along with a casualty message. With =2, did notice ground crediting messages (such as "ship AAA") for player kills are displayed.
autoLogDetail=3, only additional stat displayed observed at this time has been xxplayer has RTB. Seams as if addition Stat messages should be displayed.
Found that the stat messages are in the "netmessages.properties" file in the i18n folder. If using using HSFX, there is a "netmessages.properties" file placed the Files/i18n folder which has additional messages.
Do not know the mechanism so to speak of how a message is triggered, but sure many here do.