You are talking about two completely different concepts, neither of which
should ever apply to a self-defense situation.
Suppressive Fire has been discussed extensively. Here's one thread:
http://www.thefiringline.com/forums/...d.php?t=195168
One shot, one kill isn't a term that should be applied to self-defense situations, either. It's a phrase that has been thrown around the sniper community for YEARS before it gained popularity with the rest of the world. The entire concept of "one shot, one kill" doesn't even apply to self-defense, CCW, or PISTOLS even in the most extreme cases.
It's applicable to the shooters that have the training and skill to take a single well aimed shot from considerable distances and kill someone.