Two thoughts on this... first off, if I were in a position at NS to make the decision, I would either TELL (not ask) CSX that I will be running it across that portion or just do it without mention. My trackage rights, my trains. I'm sure a few CSX guys will jump me for it but... I'm NS and no blue and gold is going to tell me what I can put on my trains.
Second, 765 has never been closer than 1 hour for me, and most times I've driven 3-4 hours to reach the START point of a chase, let alone driving even further away after the trip starts. So it's not going by my house either. Lots of people drive to see it. So sorry if it sounds harsh, but the "it isn't coming to my town" is starting to wear on me.