because of this it is only natural that you can see how the chords and scales fit together as they are linked. and the more complicated chord the more obvious which scale it belongs to

This is also good to know when making your own chord progressions and lead guitar solos. The more complex the chords are, the more limited in scale/mode choice you have. If you keep things to basic Major and minor chords you can really move around a lot more than if you have complex extended chords. I try not to use massively extended chords for this very reason unless it's for a very specific purpose.. I tend to stick with basic Major and minor chords, as well as Major and minor 7ths.

If you are using the 1 3 5 notes in the chord, it could be any scale or mode that has those 3 notes in it. If you are using the 1 3 5 7 9 (which is really a 2 note but one octave higher) then it could be any scale or mode that has those 5 notes in it.. but see how much more limited you are?