David,
My sense is that the radiologist is ready to start radiation right away, but wants to be clear that brain radiation is not advisable, else he'd perhaps be doing both with each visit. I believe the schedule is for 6 weeks radiation. This'll start quickly, but the chemo doctor is a laggard both now and via reputation, and I'd consider my friend lucky if he started chemo within a month. It is sad for me to watch this. There is more I could say about history of treatments here (and with my friend's family) but discretion precludes it.