I agree -- I will add that for me, one of the differences in the testimony of RZ vs. Gracie is the weight I give to likelihood of possibility of the event; "cleanliness," i.e. no taint, bias, witness gain (reward, attention, praise), or bias; believability of witness; and type of event. I think RZ's testimony may have been unintentionally biased because of the posters & signs with NC's picture everywhere, and the low likelihood of RZ being dead-on accurate since she did not know NC, and had never before stood beside her (for height, build, distinguishing characteristics, etc.). Gracie had a much better shot at ID-ing JY because of the length of time she saw him and that she saw him twice, and the event that made her specifically remember the event.
And, as many others have stated, I have waited on a couple of customers in my high school and college summer jobs, and I am more than 30 yrs removed from them, and I still remember a few azzholes I encountered "across the counter." Grrrr. IMHO -- that's just me.