Everything is subject to change, and often doctors may not agree on evertyhing, and there are different types staging, restaging, from clinical, pathological and surgical. The surgeons sometimes don't know the extent of surgery until they get in there, and if they can't get it all without clear margins, is more extensive, they will take out what they can, and leave the rest for chemoradiation or radiation. The BOT has deep musculature, not just surface, contained like the tonsil, and removing a tumor from there can be debilitating. As mentioned, get a copy of your medical records for your own file. I'm surprised no chemo either, and only 33 rads, not 35, but depends on the delivery method, Gy, fractions too. As for IMRT, and the salivary glands, IMRT has dose painting, and can avoid that structure, and usually keep the dosage under 30Gy, usually around 26Gy, to the salivary glands, to protect it, anything higher may permanently destroy it being over its total toxicity level. Are both sides, bilaterally, being treated? That makes a difference too if one side is not treated with rads. With HPV it seems some are reducing chemo, radiation, but not everyone is.

Good luck.