Whew...curious indeed!
1. I'm currently checking all the WPs I made or fixed / corrected / tweaked / improved myself. Other waypointers' files may come afterwards. (but read 4!)
2. If it's true what Pierre-Marie said (and there's no reason not to believe him, it's just that I don't know e.g. your cs_havana waypoint), then it may be necessary to have a look at least at the older waypoints you made - new bot versions may require different WP placement and open new possibilities.
3. I'm only making / checking WPs for custom maps. I don't waypoint maps in order to break records or read my name, I only waypoint them if I don't have decent waypoints. And I'm too lazy to try several WP files from the internet, there's too much junk out there.
4. I never remove the original waypointer's name! If I made the WP from scratch, you'll read my name only (duh!). If I only added / fixed 2-3 minor things, I'll keep the original waypointer's name. And if I add / fix something worth mentioning (areas without waypoints, broken ladder connections, unused possibilities, jumps not working etc.) that leads to improved gameplay, I add my name behind the existing one.
I don't want to take credit for other people's work!
*note* rewrote the whole post, for those who have read it last night and now wonder what happened... I installed steam yesterday, played online for some hours and was pretty wasted afterwards, resulting in way too much unnecessary text...