Just my opinion
I’m a rookie here, but was dx GBS in March 2005 and spent 3 mos in hospital. To me residuals are the fact that I still don’t have all the feeling in both feet and my right hand has both motor and sensory damage. If he was fine for 2 years, it could be the start of something else. Don’t ignore the symptoms and if you think you should get it checked out, then go sooner than later.
Best of all good luck, document everything and then question it!