We have hundreds and hundreds of U/5s on the show each year. Some I can find out through paperwork, and others through when they list themselves on IMDB. Sometimes, resumes are not totally accurate, even though the actors are supposed to be as truthful as possible. I've seen many people list themselves as having had contract roles (aka series regular) roles on "Days" in their resumes, when in truth, they were not series regulars/contract, but recurring. Perhaps his name was mistakenly left out of the credits in 2005 (it happens sometimes, but rarely), but if he was a principal guest, he should have been listed in the credits. He was not. So, more likely, he was instead a U/5 and played one of the smaller roles on Days in 2005 (a delivery man, moving man. cop, goon, etc...)