Thank you for your assistance Sankar and I apologize for the late response (out of the country).
I totally spaced on Order of Operations and the use of context filters (though I have used them several times before).
One last question - Can I use a filter and select 2015 AND 2018 and see the agents with most records in each of those years in the same view (those agents may not necessarily be the same).
I am not asking to add 2015 and 2018 and show me the agents with the most records after the aggregation.
Now that I have the context filter in place, I see certain agents when I select 2018; however, the 2018 agents change when I also select 2015 (the 5 agents in 2015 AND 2018 are now all the same).
I am obviously forgetting s/thing or do not understand s/thing.
Any additional help you provide is appreciated.
I will open another discussion/question if necessary.