So to check the bearing I'd see if it has play when I have it apart?
Yes. Big, we all seem to be thinking it's your outer bearing: #15 in the Bike Bandit schematic you linked. Again, it's a $36 part, so even if you are wrong, didn't waste much money troubleshooting.
To test the bearing, just use your fingers when it's apart (like in the pic above). Stick your fingers in there and rotate the inner ring. Then see if you have any wiggle to is. There should zero wiggle on that, plus if you have any sensation of grating or metal on metal inside the bearing, toss it.
I replaced my fronts at about 60K, when we took the old bearing out, it completely fell apart as we took it out. Not good.