Algy, Aisleman.
Yes, if the citation came off west apron the clearence would have been R5.
What stunnes me though is that when you leave west apron for R5 you go due north whilst if you go R6 you go south east.
One look at the chart and one at the compass would have done it.
Now, at the end of R6 there is a stop sign and flashing lights before you enter RWY 36R. So, the ATC tapes have the answer.
Who was talking to whom at that point or wasn't there any talking.
A pilots nightmare, you see it but can do nothing anymore.
Regards, AV
ps Algy, greetings to James B.