Quote - interesting. 
i was watching a video for a tutorial and the guy said that a lot of times people make the mistake that the diffuse color is 100% and then they add a little of SS: he said that the SSS should be 100% since it is the color under the skin and that the skin is translusent( is this even a word) ? 

by definition, translucent means that you can't entirely see through it.  what most shaders for Poser don't account for is the yellow of dermal scattering,  and that's not dealing with how much opacity the skin has.   so no, not all of how skin looks is SSS.  if it was, we'd all just look red, and you wouldn't be able to see skin surface at all.   besides, what does "100% SSS" translate to physically?  it doesn't make sense to decide that 100% of your light rays will enter the skin, not be reflected by the skin, not get scattered within the skin, scatter in the subdermal layer, not be absorbed or scatter in a direction not captured by your eyes, and be scattered back  out to be seen by the viewer.