Aha! figured it out.

Updated Plunk <http://plnkr.co/edit/unk9hj?p=preview>

New plunk clarifies/obviates what i learned re: bindings. Watch objects and 
arrays (javascript things that are passed by reference) so what i was 
trying to do with array indices or function return values on Ctrl scope 
didn't behave as i thought they would. $scope.$watch can be helpful, but it 
could also change the way model updates are interacted with on the 
controller (uncomment a block in the plunkr)

My confusion wasn't due to some angular black magic... just javascript! 
Hope the plunk helps somebody else who's stumbled on this, too. 

-Danny

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