Hello. I'm sorry you have need to be here.
Having been around this board for 6 years now, my answer is there is absolutely no question. You must have the rads to have a chance of beating this cancer. This is a nasty aggressive cancer and you must hit it hard. Sorry if it isnt what you want to hear, but, I've seen too many die thinking they had beat this with just surgery.
I wish you all the best . Everyone here wants you to be a survivor and we will help you any way we can.
Tammy

Caregiver/advocate to Husband Kris age 59@ diagnosis
DX Dec '10 SCC BOT T4aN2bM0 HPV+ve.Cisplatin x3 35 IMRT.
PET 6/11 clear.
R) level 2-4 neck dissection 8/1/11 to remove residual node - necrotic with NED
Feb '12 Ca back.. 3/8/12 total glossectomy/laryngectomy/bilat neck dissection/partial pharyngectomy etc. clear margins. All nodes negative for disease. PEG in.
March 2017 - 5 years disease free. Woohoo!