Isolated ground versus self ground outlet

Just in case you weren't aware, there's already a plethora of information on this subject on this website. Just type some of those key words in the search box, and I'm sure you'll find some of your answers that you're looking for. 

I tried but was too dumb to figure it out. My question about the four outlet receptacle is a good question. Hopefully someone will offer insight.

Isolated ground bypasses the wiring of the duplex. It's a straight run from your system ground to the grounding buss in your service panel.