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I figured all this out for D8 ... the D7 concept is the same but there's a bit different access, etc. The problem I was having before was how to pass exposed filter arguments to contextual filters - wasn't sure if needed another view as this article was insinuating another view when stating "values returned by our other view to populate". Simply needed to make sure exposed form in block checked to yes.

Here's a link to the working code I posted for Drupal 8 conversion:
https://drupal.stackexchange.com/a/269296/18513