On average, does just about everybody pass the SSDI review if one is taking the prescibed medications and following up with doctors?

Has anyone here ever been removed from SSDI on a review?

My husbands case worker feels he will likely win his SSDI case yet becuase he is only 42 he will need a review in 12 mnths. My husband has a seizure disorder, he had a brain tumor removed.

Also what is SSDI Title 2? Is

Thanks!