OK one last update, probably the final one.
I was able to do as I hoped and I made a to-go order at Q39 for their brisket plate which has beef burnt ends and brisket slices. It's the only way to get their burnt ends and seems they don't offer a straight burnt end plate.
I'll keep this update shorter.
The burnt ends were good to go! They had very good flavor. I think Joe's may barely edge them out on flavor but Q39 had better texture and juiciness.
The brisket slices were good and beefy as well.
The only issue, and it's a real one, was the size of the plate being small!
For a $24 plate I got 3 slices of brisket (not big slices at all) and about 6 burnt end cubes. I don't feel that this is a good meat to dollar ratio at all, especially compared to all the other places and even the other plates of food we got while at Q39.
I don't know if ordering the same thing in the store gives more vs the to-go order having to fit in a different container vs a plate but I really think there should be at least 25-33% more beef on that plate.
The grilled seasonal veggies were still great! (squash, zuchini, onion, carrot, and broccoli)
Well that wraps up my KC BBQ adventure. I have a pretty good feeling I get what it's about and have solved the mystery of KC "burnt ends". To me they are simply just the brisket point cut up into cubes and really nothing magical beyond that, but hey. Good brisket point is magical on it's own regardless of the name it's given or being cut into cubes :D
Thanks for all of the input and suggestions folks. It was a great help and lead to a fun journey :D