I noticed that the waypoints in the campaign only go 2/3rds of the way through the map. I finised the waypoints myself, when I was bored of working on platform and wanted to see some pretty scenery, and noticed this after playtesting the added waypoints: The grunts at the end of the map now move.

Why is this? The grunts don't use waypoints, do they? I'm a dumb n00b asking a dumb question.

Can someone tell me why this is? I don't have a clue and I'm actually thinking of trying my hand at making a campaign map, and want to know what makes the grunts tick before I try anything.
[topic #2]Part 1 of the campaign is hilarious to look at and actually fun to play if you go with plasma/rifle combo and only use the secondaries. plasma for crowds, rifle for turrets and snipers. Part 2 is easiest if you go with flamer and wallrun around/past groups while reloading. Part 3: complex double bounce shots can kill the smg turret without revealing yourself. Use the smg to shoot around corners and use the rocket to kill the rocket grunt before he can fire... while also making a mad dash to the finish.[/topic #2]
I lost the game.